Postpublished at 15;55
Rightio, time to pulls the curtains shut on this live text.
But Manchester United and Swansea are on their way out at the Liberty Stadium.
Get across the live text over here.
Whittaker off after two yellows 187 secs apart
Pelle slots in from close range after Mane pass
Tadic fires in second from 10 yards
Tadic's second poked in from two yards
Mike Henson
Rightio, time to pulls the curtains shut on this live text.
But Manchester United and Swansea are on their way out at the Liberty Stadium.
Get across the live text over here.
Southampton 3-0 Norwich
Ronald Koeman is asked about Dusan Tadic's reaction to the foul which resulted in Steven Whittaker's second yellow card.
"I will talk to him about fair play," says the Dutchman.
Southampton's Dusan Tadic: "The defeat in midweek against Midtjylland was maybe a good wake-up call for us and we showed a great reaction today we played attacking football.
Asked about his card-waving reaction to the foul which prompted Steven Whittaker's sending off: "I think it was a really obvious yellow card because I was going in on goal. I think sometimes you need to help the referee, I think we help him with reaction."
To be fair to Tadic, I don't think he quite understood the controversy around his reaction.
Steve Claridge
BBC Radio 5 live at St Mary's
"As soon as Norwich went down to 10 men it was game over. Ronald Koeman was nice and positive, he put two up front and went for the jugular. You just wonder if Norwich lack a little bit of Premier League quality."
Southampton 3-0 Norwich
Norwich City manager Alex Neil: "The manner in which we relinquished the record was disappointing. That wasn't like us. We didn't start well, even 11 v 11 we were poor, our use of the ball was poor. I think Whittaker's first yellow was a bit soft, he was just trying to get back in position, but they were silly decisions and they cost us. We didn't deserve anything from the game and we need to be better for the next match."
Southampton's Ronald Koeman
"It was a very positive result.
"Last Thursday was a big disappointment and it's always hard to start well, but we played very well at the beginning.
"The goal before half time broke the game open, and I'm very happy about how we played in the second half - there was lots of pressing and we created some great chances.
"Mane is the type of player who makes a difference, he's an important player for us and one we won't sell. Victor Wanyama is a key player and for him the answer is the same as for Sadio. They will stay at Southampton, I'm 100% sure about that.
"We need another centre-back and we're working hard to bring in a new player in that position."
Saints have been heavily linked with Celtic's Virgil van Dijk.
Southampton 3-0 Norwich
Ronald Koeman has come out swinging at those deadline day vultures who are looking to pick off some of the juiciest parts of from the Saints squad.
"The same answer for Victor and Sadio - we do not sell. They will stay at Southampton, I am 100% sure," he said.
"They need to respect their contracts and show the commitment that Sadio is showing."
Full quotes to come.
Southampton 3-0 Norwich
Southampton striker Graziano Pelle: "Sadio had a great game as he does most of the time. I am really proud of the support that we have had from our fans despite the results so far this season."
Southampton 3-0 Norwich
Southampton captain Jose Fonte speaking to Sky Sports: "It is always important to get the first win. We have not had the start we wanted but we are happy to get back to winnning ways with a good performance.
"We are seen as a good team and we need to win. That is the mentality we have. We have a break now and we can approach the next game with more confidence. It is a great three points for us."
Sadio Mane (Southampton)
Sadio Mane has been awarded the man of the match gong, but is not offered up by the Southampton press team to receive it in person in front of the cameras.
The Senegal international had five key passes today, two of which were direct assists for goals, and 40 passes in total in the opposition half. He topped the Southampton stats in all those categories.
Steve Claridge
BBC Radio 5 live at St Mary's
"Southampton are the first team I've seen in a long time this season play two proper wingers - Mane on one side and Tadic on the other - and they've got their just desserts."
Southampton 3-0 Norwich
Southampton 3-0 Norwich
Norwich's best chance comes far, far too late.
Bradley Johnson's meaty shot is palmed back into the danger area by Maarten Steklenburg, but Gary Hooper punts the follow-up wide from 12 yards with the goalkeeper out of position.
Southampton 3-0 Norwich
Juanmi has looked bright since he has come on and he almost gets Jay Rodriguez in as he feints to shot and instead dinks the ball towards his Southampton team-mate. Just overcooked.
Southampton 3-0 Norwich
Three minutes added on.
Southampton 3-0 Norwich
Cameron Jerome has had just 22 touches - the fewest of any Norwich player on the pitch still.
It's been a long day for little reward and he is given the last few minutes off with Gary Hooper on in his place.
Southampton 3-0 Norwich
Norwich with a late corner in front of their own fans, who applaud heartily as Robbie Brady comes over to take it.
They also ooh and ahh generously as he sends an ambitiously curling looping effort over the top.
Southampton 3-0 Norwich
Southampton 3-0 Norwich
Norwich have not had a shot on target in the match. Alex Tettey has only their third attempt and it is a shocker. Leaning back, the midfielder sends it well over the top and towards the back of the stand behind Maarten Stekelenburg's goal.
Southampton 3-0 Norwich
James Ward-Prowse curls the ball round the wall but wide of John Ruddy's post as play gets back under way in the wake of Sadio Mane's departure.