Jonathan Agnew
BBC Test Match Special

"Where did that come from? It really did bounce. And it went to Cook at a incredible pace. I think that would have got anybody out."

Graeme Swann
Ex-England spinner on BBC Test Match Special

Image source, AP

"Three is a reasonable number of wickets, although if it included de Villiers England would be a lot happier going into tomorrow."

Moeen switches ends to replace Broad. After four balls, Cook stops him and calls "Compo" to leg slip. Four men around the bat, but De Villiers still looking as comfortable as a man with his pipe and slippers. Maybe three overs left in the day.

Shannon McKee: ‏If Anderson isn't fit for the 2nd Test, Mark Footitt should play. I like Woakes, but he hasn't done enough in this Test.

Out of step with his blocking batting, Du Plessis drops one at his feet and calls De Villiers through for a short single. Odd, given the circumstances. As he has done all day, De Villiers appears to have oodles of time to play the ball. Take guard, watch bowler. See ball, decide which shot to play. Have cup of tea, read paper, pop to the shop, then play shot. 

Moeen off, Steven Finn on. "You've not seen nothing like the mighty Finn," sing the Army.

JoElle:‏ We've had more dramatic Tests in 2015, but this is the one I'm enjoying most.

Image source, AP

The light looks set to hold, meaning we will have a full day's play. Du Plessis chews his gum - there's more life in his mouth than there is in his bat. James Taylor goes in at silly point, while bowler Stuart Broad tells another fielder to come "nice and tight". Broad even tries running in behind the umpire, appearing at the very last moment, in a bid to disrupt FDP. I doubt dynamite would shake Du Plessis.

Greg: ‏People talk about problems with openers but England haven't had a good wicketkeeper for many years and it hurts them often.

Anand Dahihandekar: Bad miss Johnny. Will it cost the Test match?

Mike Ball: ‏England and SA showing in this match why you should pick specialist keepers. I know Bairstow keeps for Yorkshire, but he's not great.

Moeen still round the wicket to De Villiers, who has two catchers on the leg side. One is Alastair Cook, who is frantically trying to get the attention of Alex Hales. "Halesy, Halesy!" he shouts. I can't see Hales, but can only assume that he must be day-dreaming. There are 20 minutes left in the day.

South Africa second innings: 133-3 (42 overs)

Batsmen: De Villiers 35, Du Plessis 8

Fall of wickets: 53-1 (Van Zyl 33), 85-2 (Amla 12), 88-3 (Elgar 40)

Bowling figures: Broad 10-3-24-0, Woakes 6-2-17-0, Finn 6-2-24-2, Stokes 7-1-26-1, Moeen 13-1-36-0

England second innings: 326 (Bairstow 79, Root 73, Piedt 5-159)

South Africa first innings: 214 (Elgar 118 not out, Broad 4-25, Moeen 4-69)

England first innings: 303 (Compton 85, Taylor 70, Steyn 4-70, Morkel 4-76)

Full scorecard

Andrew Samson
BBC Test Match Special statistician

"It's 38 Tests since England last had a stumping. India's Pujara, in 2012 in the second Test in Mumbai, stumped by Matt Prior off Graeme Swann for 135."

Graeme Swann
Ex-England spinner on BBC Test Match Special

"South Africa have just had a huge let off there. Jonny Bairstow was blinded by the batsman and didn't see it until it was too late. But they can't cry over spilt milk, it's gone."

I actually have a bit of sympathy for Jonny Bairstow here. It was tricky, but far from impossible, so a definite error. He knows it too, and you can tell how much it means to him by the disappointment in his reaction. De Villiers, after that reprieve, is back into the dead-bat groove.

Graeme Swann
Ex-England spinner on BBC Test Match Special

"You should have seen the size of the smile on Graeme Smith's face when he left his seat. It's never easy when a batsman goes down the wicket and tries to cover the ball and the ball turns sharply."

Graeme Smith
Ex-South Africa captain on BBC Test Match Special

"That would have been a massive dismissal before the end of play."

Image source, Getty Images

Oh, Jonny. As long as these mistakes exist, questions over his place will remain. It's a difficult stumping chance in that he was unsighted, but AB de Villiers was miles down the track, not a chance of getting back. From round the wicket, Moeen gets between bat and pad, but Bairstow can't even get a glove on it. He beats the turf, Alastair Cook closes his eyes. England have given De Villiers a life.

thesaladdodger: ‏It's a big issue. Where are the South Africans? Big tour, good game...but no interest?

Jo: That makes for really depressing reading.

Rob Meech: Can't compare a five-day Test with one BBL match. What's the entire attendance for the Tests?