Get Involvedpublished at 10:06
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Don't forget to keep your 12 Cricketing Days of Christmas coming. I'm told we're short of six and 11.
Root 60* and Taylor 24* at close
Morkel removes Compton for 49
Steyn has scan on shoulder injury
Broad 4-25 & Moeen 4-69 in SA's 214
Opener Elgar carries his bat with 118*
Stephan Shemilt
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Don't forget to keep your 12 Cricketing Days of Christmas coming. I'm told we're short of six and 11.
Graeme Smith
Ex-South Africa captain on BBC Test Match Special
"Dean Elgar's personality shone through in his celebration for his century. He's a punchy, feisty character. He's been a class above today."
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Graeme Richardson: 80+ lead for England is priceless. Let's finish them and bat them out of the game.
Richie O'HaraBeamand: Well batted Dean Elgar! Superb effort, England in a great position from here though
Dale Cooper: I leave the room for 10 seconds and that's the innings over.
BBC Test Match Special
Stay tuned to TMS this lunch time. The team are currently taking a look at that one-sided second Test between Australia and West Indies in Melbourne, then will continue to reflect on the summer Ashes series with the help of Stuart Broad and Joe Root.
South Africa first innings: 214 (81.4 overs)
Not out batsman: Elgar 118 not out from 246 balls
Fall of wickets: 0-1 (Van Zyl 0), 14-2 (Amla 7), 100-3 (De Villiers 49), 113-4 (Du Plessis 2), 137-5 (Bavuma 10), 150-6 (Duminy 2), 156-7 (Abbott 0), 210-8 (Steyn 17), 214-9 (Piedt 1), 214-10 (Morkel 0).
Bowling figures: Broad 15-6-25-4, Woakes 14-1-28-0, Moeen 25-3-69-4, Finn 15.4-1-49-2, Stokes 9-1-25-0, Root 3-1-11-0.
England first innings: 303 (Compton 85, Taylor 70, Steyn 4-70, Morkel 4-76)
England took the last six South Africa wickets for 77 runs this morning. Stuart Broad started it with some uneven bounce, then Moeen Ali spun a web, before Steven Finn finished it with the new ball. If England get anything in excess of 200 in their second innings, it seems unlikely they will be beaten.
Geoffrey Boycott
Ex-England batsman on BBC Test Match Special
"Elgar stuck in there and played very selectively. But the real accolades go to England. What a terrific performance by the England bowlers. They've given their team a match-winning lead, no doubt about that. There's no way back for South Africa."
Indeed it has been fantastic from Dean Elgar, who becomes only the sixth South African to carry his bat through a Test innings and the second since they returned to Test cricket in 1991. Imagine the heap the Proteas would be in without him.
Neil Manthorp
BBC Test Match Special
"South Africa are in a great deal of trouble in this match, but what a brilliant performance by Dean Elgar."
Morkel c Root b Finn 0 (SA 214 all out)
Don't worry about extending the session, South Africa are all out. Steven Finn needed only three balls at Morne Morkel, who fended an off-stump riser to Joe Root at second slip, where a smart catch was taken. Farcically, the batsmen get to the boundary edge then are asked to wait for the front foot to be checked. No issue. South Africa are all out for 214 and England lead by 89 runs.
The giant Morne Morkel shuffles out as South Africa's last line of defence. He's opened for South Africa before (in an emergency) so not the worst number 11. With the Proteas nine down, this session can be extended even further, taking us to the three-hour mark.
Geoffrey Boycott
Ex-England batsman on BBC Test Match Special
"A beautiful teaser from Finn, right up there, full, outside off stump in that corridor. Piedt doesn't look a very good batsman - his feet were a long way from the pitch of the ball."
Piedt c Bairstow b Finn 1 (SA 214-9)
The second new ball does the trick, as it was always likely to against the tail. Dane Piedt is on his way, undone by the first delivery of the returning Steve Finn. Full, inviting the drive, with a meaty edge going through to wicketkeeper Jonny Bairstow. England one ball away from batting again.
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Tim Hutchings: 12th man a swooping? Gary Pratt in the 2005 Ashes?
"He's big, he's bad, he's better than his dad," sing the Barmy Army of Stuart Broad, who gets steepling bounce to Piedt. The ball smashes in the batsman's gloves and almost drops on to the stumps. Another lifter has the jackknifing Piedt in a tangle, earning a stare from Broad. Fiesty stuff with the hard leather.
South Africa first innings: 213-8 (80 overs)
Batsmen: Elgar 118, Piedt 0
Fall of wickets: 0-1 (Van Zyl 0), 14-2 (Amla 7), 100-3 (De Villiers 49), 113-4 (Du Plessis 2), 137-5 (Bavuma 10), 150-6 (Duminy 2), 156-7 (Abbott 0), 210-8 (Steyn 17)
Bowling figures: Broad 14-6-24-4, Woakes 14-1-28-0, Moeen 25-3-69-4, Finn 15-1-49-0, Stokes 8-1-25-0, Root 3-1-11-0.
England first innings: 303 (Compton 85, Taylor 70, Steyn 4-70, Morkel 4-76)
SA 213-8
Alastair Cook immediately takes the old leather to umpire Aleem Dar, who receives the new cherry and shows it to all corners. As the Kings of Leon play on the tannoy, Stuart Broad is summoned. A new game now.
Andrew Samson
BBC Test Match Special statistician
"Only one South African has carried their bat since the country returned to Test cricket: Gary Kirsten at Faisalabad in 1997."
What does Elgar do here? Try to farm the strike? Defence for four balls, then what? Cook toys with the field and gets a fifth dot. "High class," says Jonny Bairstow. For the sixth ball, Elgar goes on the sweep and gets a couple. On comes the new ball - Dane Piedt is set to face it.
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TheBirminghamSix: Moeen Ali in with a chance of a fifer here.