Postpublished at 13:22
Is this the cricket equivalent of 'Turtle power'?, external
Stokes 258 off 198 balls
Second fastest Test double century
Bairstow 150* - maiden Test century
Highest Test sixth-wicket stand (399)
Amla 64*, De Villiers 25*
England lead 1-0 in four-match series
Marc Higginson and Justin Goulding
Is this the cricket equivalent of 'Turtle power'?, external
Jonny Bairstow's mum Janet on Test Match Special: "He's in a good place at the moment and enjoying his cricket. He has worked very hard and he deserves it."
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What a session. And what a day's Test cricket, which will be forever be remembered as the Ben Stokes Show, with a star cameo from Jonny Bairstow. If you're only just joining us, then I can only offer my sympathies. Scroll down for the full story...
Michael Vaughan
Ex-England captain on BBC Test Match Special
"That last boundary was a reminder that it is a good pitch and there are runs out there. Mentally South Africa just have to play the ball and stick to their game plan. The way that England have played can do funny things to the mind though."
Elgar has been about as reluctant in attack as a sulky teenager is to leave his bedroom, but he choses the final ball of the session to unfurl a wonderfully straight checked drive. Let's have tea, shall we?
Steven Finn, who took six wickets in the first Test, gets the last over before tea. I wouldn't rule out something happening here...
Michael Vaughan
Ex-England captain on BBC Test Match Special
"You generally know when a batsman reviews it straightaway it is not going to be out."
SA 19-1
Clear inside edge. The decision is overturned. As you were, gentleman. Maiden over.
Elgar 4 (SA 19-1)
Moeen strikes! It's full, Elgar pushes forward, the ball strikes him on the pad, the finger is up! But wait - Elgar wants a review. No hesitation in asking.
What are South Africa up to here? Almost another run-out as Elgar works Moeen to leg, thinks about a single. Panic over.
And we have spin. Moeen Ali replaces Broad for a twirl before tea.
Michael Vaughan
Ex-England captain on BBC Test Match Special
"Amla is a popular figure but he has been struggling of late. There are many that would like to see a few hours of him batting. That triple century he got at The Oval, from the minute he walked to the middle he didn't look like getting out."
Anderson in for his fourth over. England's premier bowler has four slips and a gully ready and waiting. Just a hint of outswing - no more than that - and Amla stands tall to force that through point for his first intentional boundary.
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Adam Taylor: I'm sure he's delighted by the score, but looking very difficult to see how Ian Bell could make a comeback.
Jamie Williams: I'm being very English and starting to feel sorry for the South African's.
Bloody Bishop: Dear England I'm working today and off next two days. Please have a heart save some excitement.
Elgar, hunching over his bat like a student in a dimly lit library, is solid in defence to Broad. A maiden over. We have 10 minutes until tea.
Michael Vaughan
Ex-England captain on BBC Test Match Special
"It's mental disintegration what England have done to South Africa. There is no swing, it's a perfect batting day and Van Zyl will be back in the dressing room thinking 'why?'"
Oooh! Almost another for England as Elgar, having eased Anderson through cover for two, sees an inside edge just evade his stumps. Amla then drives streakily wide of three expectant, hungry slips. Four to the total but nervous times all round.