To mark your card, England next play on Tuesday against Bangladesh. That's a 06:00 BST start in Dharamsala.
The next World Cup action is tomorrow, when the Netherlands take on Pakistan from 09:30.
Post update
Steven Finn
Former England bowler on BBC Test Match Special
Jos Buttler is not an up-and-down player. He is a very level character and he's a master at staying calm.
The messaging externally will be about playing freely, about taking the game on. But I do think that behind the scenes, he will be having those conversations with players to recognise what has happened, slow things down and figure things out.
'A long way short of our best'
More from Jos Buttler...
On conditions: "I think the conditions changed, the pitch skidded on even better under lights. That's why we would have bowled first as well but I still think it was a good wicket.
"We were a long way short of our best and still made 280. If we had batted as we can, even with the conditions we could have got to a more competitive total. But given the skill New Zealand batted with, it may not have been enough anyway."
On Joe Root: "I thought he looked back to his old self, there's never any question of that with Joe. Whatever format, he's a run-maker. He's been the best player in our team for a while but even for the best players, it's nice to spend some time in the middle."
On Ben Stokes: "He's working hard with the physios and fingers crossed he can get fit as soon as possible."
Post update
Steven Finn
Former England bowler on BBC Test Match Special
This England team will stick to the way that they play, we know that.
The thing that they'll review after this game is their attitude, is whether they committed to their approach the bat, whether they were disciplined enough with the ball.
Only they will be able to sit in the dressing room and review that. Everyone can play badly, and in a long tournament like this, every team will have bad games.
In a way, it could be a good thing that they have had this wake-up call early in the tournament rather than get mauled in a semi-final and go home with your tail between your legs.
But England will have to wise up a bit when it comes to their next game because they'll have to get that momentum back quickly. A game like this can really knock the wind out of you.
'We weren't clinical and didn't execute our shots'
England captain Jos Buttler: "We weren't clinical with our execution with the bat. Some of the dismissals were the right shots but not executed correctly.
"We'll keep being positive and playing our way but this shows that you need to get good scores on the board if you're going to defend them on decent wickets.
"You can't be too defensive, we just weren't clinical and didn't execute our shots. New Zealand played great cricket shots and got value for them.
"The margin for error was very small in that powerplay. I can't think of any massive shots Devon Conway or Rachin Ravindra played early on but they scored very quickly. They played exceptionally well and put together a fantastic partnership. We were well beaten today."
Post update
Steven Finn
Former England bowler on BBC Test Match Special
Everyone barring India has come into this World Cup with very limited experience of playing one-day international cricket over the last four years.
That's partly because of the pandemic, but because of franchise tournaments and the shorter formats taking precedence.
So I think we are seeing this as a white-ball tournament, with plenty of noise and anticipation, and the natural instinct - especially as a batter - is to play in that style.
It is hard, especially for someone like Harry Brook who has been feasted on T20 cricket, to adapt his game for this format. But he is a fast learner, so he has to switch on and tell himself to bat for 35 overs, get a century and influence the game.
Post update
More from New Zealand captain Tom Latham: "Trent Boult and Matt Henry did such a good job for us today. We know that England are going to come hard at us, but our guys took wickets at times when we really needed them to and got some reward out of the tough overs.
"It wasn't in our plans to come out and play as hard as they [Ravindra and Conway] did but it was pleasing to see how they played proper strong cricket shots and just reacted to what was being bowled to them.
"They both obviously felt good but it was a delight to watch. We're super proud of Rachin, batting at three for the first time in an ODI, and he played beautifully."
Post update
New Zealand captain Tom Latham: "Yeah, a fantastic performance. It was a brilliant partnership between Devon and Rachin but going back to our bowlers, they did a fantastic job to set us up.
"We were very happy to restrict them to a below par score on that surface and from overs 30 onwards particularly, we were fantastic.
"It has been a quick build-up, but we've got a lot of experience in this team and that's really important. One of the biggest things about playing here is adapting to conditions quickly and we did that really well, and it helps that we have players who have played in India a lot recently."
'Really special moment'
Player of the match, New Zealand's Rachin Ravindra: "Sometimes it's a little bit unbelievable. It was great to have a great day out.
"The boys bowled and fielded really well to restrict them to 280 and then lucky I had Devon out there with with to show me how to do it.
"I've spent a lot of time with Devon, we're very close mates so it was really special to share that moment with him. Spending so much time at the crease with him before meant I was probably more comfortable than I might have been.
"We all knew four or five years ago at Wellington that Dev was going to be the player he was because of how he works and the example he sets for himself. But above all he's a nice guy."
On batting at three: "I found out yesterday. I got the opportunity and now we'll see what happens. Luckily I'm quite a good sleeper. If I wasn't, I think Id have been struggling.
"We're aware it might have swung at the top but it was a very nice surface to bat on. It was similar to the surface for the warm-up game in Hyderabad. Having that bit of translation from wicket to wicket was quite cool."
Post update
Prakash Wakankar
BBC Test Match Special
Rachin Ravindra's father is from Bangalore. Apparently his forename, Rachin, is a combination of Rahul and Sachin (Dravid and Tendulkar).
If that is true, then those two fine batters will be very proud of how he has played today.
Post update
More from Jos Buttler:"We won't get too down on ourselves in the same way we wouldn't get too high if we won in this manner.
"I thought we were well below par and obviously, judging by how New Zealand batted, it showed that. We were aiming for around 330. It was a good wicket to bat on and I think it got better under lights.
"With the start they got off to, it was hard to build any pressure."
'A tough defeat to take'
England captain Jos Buttler: "A very disappointing day. We were very much outplayed by New Zealand and it's a tough defeat to take.
"But it is just one loss at the start of a long tournament.
"There are a lot of guys in our team who have played a lot of cricket. We've beaten teams like this before and we've suffered defeats like this before as well, we won't read too much into it."
Post update
Steven Finn
Former England bowler on BBC Test Match Special
It a tournament where you play nine group games, you're going to play badly at some stage. In a way, it's good to have this wake-up call happen early in the tournament rather than in a semi-final and you have to go home with your tail between your legs.
I do think England will have to wise up when they come to their next game and they will have to build some momentum now because there is no doubt a defeat like this takes the wind out of your sails.
Post update
Alex Hartley
Former England bowler on BBC Test Match Special
Three or four years ago, 280 is a winning score. But the game has changed so much and England will know that they didn't bat or bowl well enough.
These games come thick and fast so they've got to put things right.
Post update
More from Joe Root: "It's a frustrating day but it's important to remember that there is so much cricket to come in this tournament. We won't panic, we've just got to reaffirm what we're about as a team and go more about our way of playing in the next game.
"The first game of a tournament is always a cagey affair. We got our score on the board. But credit to them, they played really well and we underperformed.
"We're a better side than that, we know that, and we've got plenty of opportunities to put that right."
'We're a better side than that'
England batter Joe Root on Sky Sports: "We were below par in all departments.
"Batting wise, I don't think we had the best of the conditions. It definitely got better to bat as the game progressed.
"But it's still disappointing because we did manage to build partnerships, but as soon as we get going we kept stalling ourselves and that stopped us getting the total we wanted.
"In the field, when you know you've got a below par score, you've then got to be above par in everything you do and we didn't manage that. We didn't play anywhere near the standard that we know we are capable of."
Post update
Steven Finn
Former England bowler on BBC Test Match Special
The toss is going to be an interesting subject of conversation over the next few weeks because of how much the conditions changed between the two innings. It'll be interesting to see whether other games follow that trend.
I still think New Zealand would have won that game, even if conditions didn't change. They were much more disciplined with the ball, Matt Henry set the tone outstandingly well and adjusted to conditions quickly.
Mitchell Santner really strangled England in the middle too. Their batters got in but nobody really took hold of the innings. We talk a lot about England's explosive lower order but they didn't have the platform to allow them to fire.
Seeing how Matt Henry bowled in the early stages of England's innings, none of England's bowlers could manage to find that same level of consistency. The dew came down a bit, the ball got wetter, so that is a factor.
It feels like a 'slam the dressing room door' type of evening.
This is also a makeshift New Zealand team, really. They didn't have anywhere near their full bowling line-up and had to really string together 50 overs.
Kane Williamson isn't there, either. So that is a very comprehensive victory for them.
Live Reporting
Stephan Shemilt, Sam Drury and Ffion Wynne
All times stated are UK
Latest PostPost update
But that's it from us for now, on the day England's World Cup got off to a chastening start.
They have been hammered by the brilliant Black Caps. New Zealand win by anything but the barest of margins.
You can read Matt Henry's report from Ahmedabad here.
Post update
To mark your card, England next play on Tuesday against Bangladesh. That's a 06:00 BST start in Dharamsala.
The next World Cup action is tomorrow, when the Netherlands take on Pakistan from 09:30.
Post update
Steven Finn
Former England bowler on BBC Test Match Special
Jos Buttler is not an up-and-down player. He is a very level character and he's a master at staying calm.
The messaging externally will be about playing freely, about taking the game on. But I do think that behind the scenes, he will be having those conversations with players to recognise what has happened, slow things down and figure things out.
'A long way short of our best'
More from Jos Buttler...
On conditions: "I think the conditions changed, the pitch skidded on even better under lights. That's why we would have bowled first as well but I still think it was a good wicket.
"We were a long way short of our best and still made 280. If we had batted as we can, even with the conditions we could have got to a more competitive total. But given the skill New Zealand batted with, it may not have been enough anyway."
On Joe Root: "I thought he looked back to his old self, there's never any question of that with Joe. Whatever format, he's a run-maker. He's been the best player in our team for a while but even for the best players, it's nice to spend some time in the middle."
On Ben Stokes: "He's working hard with the physios and fingers crossed he can get fit as soon as possible."
Post update
Steven Finn
Former England bowler on BBC Test Match Special
This England team will stick to the way that they play, we know that.
The thing that they'll review after this game is their attitude, is whether they committed to their approach the bat, whether they were disciplined enough with the ball.
Only they will be able to sit in the dressing room and review that. Everyone can play badly, and in a long tournament like this, every team will have bad games.
In a way, it could be a good thing that they have had this wake-up call early in the tournament rather than get mauled in a semi-final and go home with your tail between your legs.
But England will have to wise up a bit when it comes to their next game because they'll have to get that momentum back quickly. A game like this can really knock the wind out of you.
'We weren't clinical and didn't execute our shots'
England captain Jos Buttler: "We weren't clinical with our execution with the bat. Some of the dismissals were the right shots but not executed correctly.
"We'll keep being positive and playing our way but this shows that you need to get good scores on the board if you're going to defend them on decent wickets.
"You can't be too defensive, we just weren't clinical and didn't execute our shots. New Zealand played great cricket shots and got value for them.
"The margin for error was very small in that powerplay. I can't think of any massive shots Devon Conway or Rachin Ravindra played early on but they scored very quickly. They played exceptionally well and put together a fantastic partnership. We were well beaten today."
Post update
Steven Finn
Former England bowler on BBC Test Match Special
Everyone barring India has come into this World Cup with very limited experience of playing one-day international cricket over the last four years.
That's partly because of the pandemic, but because of franchise tournaments and the shorter formats taking precedence.
So I think we are seeing this as a white-ball tournament, with plenty of noise and anticipation, and the natural instinct - especially as a batter - is to play in that style.
It is hard, especially for someone like Harry Brook who has been feasted on T20 cricket, to adapt his game for this format. But he is a fast learner, so he has to switch on and tell himself to bat for 35 overs, get a century and influence the game.
Post update
More from New Zealand captain Tom Latham: "Trent Boult and Matt Henry did such a good job for us today. We know that England are going to come hard at us, but our guys took wickets at times when we really needed them to and got some reward out of the tough overs.
"It wasn't in our plans to come out and play as hard as they [Ravindra and Conway] did but it was pleasing to see how they played proper strong cricket shots and just reacted to what was being bowled to them.
"They both obviously felt good but it was a delight to watch. We're super proud of Rachin, batting at three for the first time in an ODI, and he played beautifully."
Post update
New Zealand captain Tom Latham: "Yeah, a fantastic performance. It was a brilliant partnership between Devon and Rachin but going back to our bowlers, they did a fantastic job to set us up.
"We were very happy to restrict them to a below par score on that surface and from overs 30 onwards particularly, we were fantastic.
"It has been a quick build-up, but we've got a lot of experience in this team and that's really important. One of the biggest things about playing here is adapting to conditions quickly and we did that really well, and it helps that we have players who have played in India a lot recently."
'Really special moment'
Player of the match, New Zealand's Rachin Ravindra: "Sometimes it's a little bit unbelievable. It was great to have a great day out.
"The boys bowled and fielded really well to restrict them to 280 and then lucky I had Devon out there with with to show me how to do it.
"I've spent a lot of time with Devon, we're very close mates so it was really special to share that moment with him. Spending so much time at the crease with him before meant I was probably more comfortable than I might have been.
"We all knew four or five years ago at Wellington that Dev was going to be the player he was because of how he works and the example he sets for himself. But above all he's a nice guy."
On batting at three: "I found out yesterday. I got the opportunity and now we'll see what happens. Luckily I'm quite a good sleeper. If I wasn't, I think Id have been struggling.
"We're aware it might have swung at the top but it was a very nice surface to bat on. It was similar to the surface for the warm-up game in Hyderabad. Having that bit of translation from wicket to wicket was quite cool."
Post update
Prakash Wakankar
BBC Test Match Special
Rachin Ravindra's father is from Bangalore. Apparently his forename, Rachin, is a combination of Rahul and Sachin (Dravid and Tendulkar).
If that is true, then those two fine batters will be very proud of how he has played today.
Post update
More from Jos Buttler:"We won't get too down on ourselves in the same way we wouldn't get too high if we won in this manner.
"I thought we were well below par and obviously, judging by how New Zealand batted, it showed that. We were aiming for around 330. It was a good wicket to bat on and I think it got better under lights.
"With the start they got off to, it was hard to build any pressure."
'A tough defeat to take'
England captain Jos Buttler: "A very disappointing day. We were very much outplayed by New Zealand and it's a tough defeat to take.
"But it is just one loss at the start of a long tournament.
"There are a lot of guys in our team who have played a lot of cricket. We've beaten teams like this before and we've suffered defeats like this before as well, we won't read too much into it."
Post update
Steven Finn
Former England bowler on BBC Test Match Special
It a tournament where you play nine group games, you're going to play badly at some stage. In a way, it's good to have this wake-up call happen early in the tournament rather than in a semi-final and you have to go home with your tail between your legs.
I do think England will have to wise up when they come to their next game and they will have to build some momentum now because there is no doubt a defeat like this takes the wind out of your sails.
Post update
Alex Hartley
Former England bowler on BBC Test Match Special
Three or four years ago, 280 is a winning score. But the game has changed so much and England will know that they didn't bat or bowl well enough.
These games come thick and fast so they've got to put things right.
Post update
More from Joe Root: "It's a frustrating day but it's important to remember that there is so much cricket to come in this tournament. We won't panic, we've just got to reaffirm what we're about as a team and go more about our way of playing in the next game.
"The first game of a tournament is always a cagey affair. We got our score on the board. But credit to them, they played really well and we underperformed.
"We're a better side than that, we know that, and we've got plenty of opportunities to put that right."
'We're a better side than that'
England batter Joe Root on Sky Sports: "We were below par in all departments.
"Batting wise, I don't think we had the best of the conditions. It definitely got better to bat as the game progressed.
"But it's still disappointing because we did manage to build partnerships, but as soon as we get going we kept stalling ourselves and that stopped us getting the total we wanted.
"In the field, when you know you've got a below par score, you've then got to be above par in everything you do and we didn't manage that. We didn't play anywhere near the standard that we know we are capable of."
Post update
Steven Finn
Former England bowler on BBC Test Match Special
The toss is going to be an interesting subject of conversation over the next few weeks because of how much the conditions changed between the two innings. It'll be interesting to see whether other games follow that trend.
I still think New Zealand would have won that game, even if conditions didn't change. They were much more disciplined with the ball, Matt Henry set the tone outstandingly well and adjusted to conditions quickly.
Mitchell Santner really strangled England in the middle too. Their batters got in but nobody really took hold of the innings. We talk a lot about England's explosive lower order but they didn't have the platform to allow them to fire.
Seeing how Matt Henry bowled in the early stages of England's innings, none of England's bowlers could manage to find that same level of consistency. The dew came down a bit, the ball got wetter, so that is a factor.
Post update
Jonathan Agnew
BBC cricket correspondent on Test Match Special
It feels like a 'slam the dressing room door' type of evening.
This is also a makeshift New Zealand team, really. They didn't have anywhere near their full bowling line-up and had to really string together 50 overs.
Kane Williamson isn't there, either. So that is a very comprehensive victory for them.
Post update
What's the opposite of the barest of margins?