More from Alastair Cook: "We didn't get the balance right today. I can't really fault the lads too much, because if you'd said we'd win the series 2-1, we'd have taken that. 

"Today is a blow and shows how much work we still have to do.

"We have players who can change the game quickly, especially with the bat. With the ball, we can get a roll and be hard to stop.

"We need consistency, especially with our fielding. Taking catches will make us a better side.

"We'll enjoy winning a series away from home."

Image source, AFP

England captain Alastair Cook: "It's been a disappointing five days; we haven't been on it. We hung in there without ever getting on top. 

"Trevor just described it as a limp performance, which sums it up.

"We spoke about trying to build partnerships, trying to get their bowlers into second and third spells. It proves sometimes you can talk too much."

England all-rounder Ben Stokes, who scored 411 runs at 58 and took 12 wickets at 29 in the series: "I still prefer batting but it's nice to be contributing with both. Consistency is something I've been lacking so it's good to get in some good performances.

"The role I've been given is to come on and take some wickets - going for some runs isn't something I've been too fussed about. So it was nice to get a few important wickets."

Who else could it have been? Well played, Ben Stokes.

Man of the match Kagiso Rabada, who took 13-144 in the match: "It was a bit up and down so the key was the hit the deck and bowl the ball in a good area and I believed you'd get your rewards."

AB says South Africa were ready to go to 5.30 in the afternoon. England weren't ready to go to 11.30 in the morning.

More from AB de Villiers: "To take seven wickets in the time that we did was not part of the thinking. We were ready to go to 5.30 today.

"I've really enjoyed being captain. I'm keen to move forward. The team is in a really good space and it's a bright future for us.

"We've got a long way to go. It's a rebuilding phase for us."

South Africa captain AB de Villiers: "I thought the boys were very fired up for this. It's been a while since we've won, so we'll enjoy it.

"I'm very excited about some of the guys that have come through and taken their opportunities. I'm very proud of Kagiso.

"It was a great team performance. We showed a lot of character."

Captains coming up....

Jonathan Agnew
BBC Test Match Special

"That was chaotic this morning, it really was. There were a lot of shots being played."

Michael Vaughan
Ex-England captain on BBC Test Match Special

"That's not good enough. There are no dead rubbers in Test cricket. To lose seven for 43 in 10.5 overs, you can't be having that."

We should put the series into context. Winning in South Africa is a fantastic achievement by this England side, even if today's capitulation leaves a sour taste. To beat the number one side in the world away from home is a brilliant effort.

Michael Vaughan
Ex-England captain on BBC Test Match Special

"Guts - Hashim Amla yesterday showed them, his thumb was dripping blood.  As soon as England hear anyone question that they had the guts and the determination to fight on a wicket with a bit of spark it'll hurt them."

"Some of those shots this morning were not the shots of a team that was thinking we can really win this Test match. It's the old adage of 'it's the way we play', regardless of the situation."

I wonder what is being said in the England dressing room at the moment? Does Trevor Bayliss own a hairdryer?

Michael Vaughan
Ex-England captain on BBC Test Match Special

"He has got a natural ability to let it go at pace. Just let him bowl."

Mark Boucher
Former South Africa wicketkeeper on BBC Test Match Special

"There has been a lot of talk about wrapping Rabada in cotton wool. But he's bowling like he's a 32-year-old - the mental side of his game is in a good way. I like his attitude."

Michael Vaughan
Ex-England captain on BBC Test Match Special

"It's been a fantastic Test series to watch, the pitches have been very good, the crowds and atmospheres have been good, the cricket's been a joy to watch."