SA 96-3published at 32 overs
Moeen races through his over, with a watchful du Plessis getting forward and smothering delivery after delivery. The crowd is just starting to fill back up as people return from their post-tea stroll.
South Africa close on 220-9 - 142 runs behind England
Anderson takes four wickets from end bearing his name
Two wickets apiece for Broad and Moeen
England bowled out for 362 - Bairstow 99, Stokes 58
Amy Lofthouse
Moeen races through his over, with a watchful du Plessis getting forward and smothering delivery after delivery. The crowd is just starting to fill back up as people return from their post-tea stroll.
England are making their way back onto the field, with Faf du Plessis and Temba Bavuma already out there, prodding suspiciously at the pitch. It'll be Moeen to get things going straight after tea.
As always, Geoffrey will be answering your questions over on our FaceBoycs live.
You can watch it below - just click the link to head to our Facebook page and ask his opinion on today's play.
Bavuma 30, Du Plessis 6
As the sun pierces through the clouds (what joy we've had with this weather today), Stokes steams in for his third over and he bowls an absolute beauty to Faf du Plessis.
Stokes gets it to comes back slightly, squaring up the South Africa captain who ends up playing it one-handed, the ball racing wide of gully and through for a boundary.
The afternoon session is done, England will be the happier team. I'm also done for now, here's Amy Lofthouse.
#bbccricket
Francis Edwards: Big innings for Faf, crazy what a different player he is in Test cricket. So flamboyant in ODI cricket.
Funny you should say that Francis... his Test average is 43.25, which is almost identical to his ODI average of 43.41!
Players and umpires keep an eye on the clock as we approach that tea break. Moeen Ali tosses up six deliveries, wide of off stump and the settled batsman Bavuma has no trouble in getting behind the balls when needed.
One more over before the break.
Geoffrey Boycott
Ex-England batsman on BBC Test Match Special
That was a neat catch by Stokes - it wasn't easy, it was low and quick.
Bavuma 30, Du Plessis 0
Bavuma has been fairly impressive in this session. The South Africa number four helps himself to a couple worked away through midwicket, followed by a single clipped towards backward square.
Faf du Plessis yet to get off the mark.
Remember, you can hear the thoughts of Geoffrey Boycott, and put your questions to him, in Boycs Facebook live, external at tea (approx 15:40 BST)
South Africa captain Faf du Plessis played nine first-class matches on this very ground for Lancashire during a two-season stint with the club in 2008 and 2009...
In comes the skipper Faf du Plessis, who sees off the rest of the over.
Moeen now has 19 wickets in this series - does he still see himself as a batter who can bowl a bit?
Geoffrey Boycott
Ex-England batsman on BBC Test Match Special
That was nice cricket by Moeen Ali and a neat catch at slip. Moeen made it drift out - a real teaser, outside off stump but at driving length. Quite frankly, I don't think Kuhn can bat. I think he's a wicket waiting to get out. His technique is not good enough. He's too bottom hand and his footwork isn't tight enough.
Kuhn c Stokes b Moeen 24 (84-3)
Gone. Moeen missed a chance of running out Bavuma but made amends by claiming the wicket of Kuhn. The England spinner bowling a good line outside off, the out-of-sorts Kuhn reaching for it and edging it through to Stokes who takes a good grab at slip. England strike before tea.
Well, Dave, Kuhn is a few closer to that ton as the first delivery from Stokes is pulled for three. It was hit with the toe end of the bat and nearly took off the head of short leg. To be fair, Kuhn should have found the boundary from that ball.
South Africa could be three down, had Anderson been accurate with this aim at the stumps.
#bbccricket
Dave Wood: How is Kuhn still in? Bet he makes a ton now.
So it will be spin as in comes Moeen. He gives it lots of flight with a slip and a short leg in place. Kuhn and Bavuma exchange singles as the leading wicket-taker of the series concedes just two from his first over.
Boycott may get his wish as it looks like Stokes will be having a bowl.
Geoffrey Boycott
Ex-England batsman on BBC Test Match Special
I'd have liked Stokes to have had two or three overs. For me, he always does something with the ball.
Kuhn really does not look comfortable at the crease and Broad is getting the better of him here. The ball nipping back, inside edges onto the pads and thighs.
Kuhn then has a half volley to drive at, but again he can't connect. Moeen Ali warming up to replace Toby Roland-Jones.
Stephan Shemilt
BBC Sport at Old Trafford
Celeb spot. Natalie Lowe from Strictly. She was Michael Vaughan's partner, you know.