Imogen: Nice to see Cook's fans (I like to call us the Cookie Monsters) defending Cook - he seems to be blamed for everything these days.

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Nice shot from Lyth, playing a back-of-a-length delivery from Henry right under his eyes and gliding it down to the third-man boundary. Not much happening for New Zealand at the moment, England are blunting their new-ball spearhead well.

Jonathan Agnew
BBC Test Match Special

"Boult didn't appeal there. He joined in at the end for the sake of it. A good decision by the umpire."

Martin Jones: Four keepers in a Test XI isn't a record. I believe Sri Lanka played recently with the following in the team: Tillakaratne Dilshan, Kaushal Silva, Kumar Sangakkara, Dinesh Chandimal and Prasanna Jayawardene. Don't know if Andrew can do better?

A yelp of frustration from Trent Boult as Alastair Cook flicks him down to the fine-leg boundary. He responds superbly though, cutting the England skipper in half with one that pitches on off and straightens. There's a decent appeal, but McCullum opts against a review, and wisely - replays show the ball flicked the back leg. Another big appeal as Boult raps Cook on the front pad, but there was a little inside edge there. Good over though.

Vic Marks
Ex-England spinner on BBC Test Match Special

"In this bowling attack, Boult bowled well at Lord's, then you've got Southee, Henry is full of potential but pretty raw, and the off-spin of Craig who is liable to leak runs. McCullum doesn't have many options. Yet there's four wicketkeepers in the team."

Brendon McCullum makes his first bowling change and summons Matt Henry into the attack. Henry bowled pretty well on debut at Lord's and his first two balls are superb, zipping past Lyth's outside edge. Lyth blocks out the rest of the over.

Darren Hawkins: I wish people would stop saying Root is too young for the captaincy, he's 25! Graeme Smith was 21 that didn't turn out too badly.

Jack Mendel: Stuart Broad should be grateful to the Kiwi tail-enders. I mean, this might be the only time he goes past 100 runs again.

This is a resolute start by England's openers, leaving the away-swinging delivery well outside off stump. Lyth retains the strike by flicking a single off his pads off the final ball of the over.

Andrew Samson
BBC Test Match Special statistician

"The New Zealand innings was the first time four men have scored at more than a run a ball in a Test innings - McCullum (41 from 28), Ronchi (88 from 70), Henry (27 from 21) and Boult (15 from 11)."

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Daniel Rajan: Death, taxes and Alastair Cook being slaughtered as soon as anything goes wrong.

We're presuming that's the answer to the question "what are the three certainties of life"?

Luke Ronchi is the man with the gloves for New Zealand on his Test debut. Southee continues the thankless task of trying to draw a loose stroke from Cook, but he's not managing it at the moment - the England captain simply blocks out a maiden.

Vic Marks
Ex-England spinner on BBC Test Match Special

"It's a big game for Adam Lyth. He just needs one big score, and he'll start the Ashes series. Two failures here, and there will be a long, agonising debate. It's the sixth opening partnership England have tried since Andrew Strauss retired."

Kesh Chauhan: I wish everyone would stop slating Cook as captain. He may not be the best but who else can take the reins? Root is not a viable alternative it's too early!

Oh goodness me, that really was close - Boult just zipping one millimetres past Lyth's off stump. Lyth responds well with a firm push through the covers that runs away to the fence. Nicely timed. His next shot is loose though, driving airily at a wide one from Boult. Dangerous.

BBC Sport's Tim Oscroft at Headingley: A gang of air stewardesses seem to have mistaken Headingley for Leeds Bradford airport...

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Harry in Bristol: Refusing to listen to TMS as I'm in the middle of my finals and the last Test cost me a few marks... Just hope I don't see any wicket alerts pop up now England are in.

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Cook's judgment looks really good here. He shoulders arms to a ball from Southee that zips over the top of off stump. And with his next shot he eases Southee to the boundary with a lovely, bended-knee cover drive that even a commando-rolling Brendon McCullum can't stop.

New Zealand's run-rate of 4.84 was the 12th fastest when a team has scored 350+ in an innings in Tests.

Geoffrey Boycott
Ex-England batsman on BBC Test Match Special

"I'd think England should be up with New Zealand by tonight. The pitch isn't doing much, that roller has helped."