Martin: The DRS process still needs some refinement IMO. shouldn't be able to check LBW if you review for caught behind.

If Joe Root is like water because of his ability to find gaps, what's Ben Stokes? A pale ale? Solid, gritty, acquired taste? Likely to explode if shook up near a locker. 

Alastair Cook? He's a cup of tea. It's difficult not to like him and he's the go-to man.

Back to the action, where Stokes smokes a full toss over the leg side for four.

Nah, no edge. Just pad.

On to ball tracking... the ball is trampolining over the stumps. South Africa lose a review.

Jonathan Agnew
BBC Test Match Special

"They were appealing for caught behind but they're going to have to run the technology to check the lbw."

What's happened here then? Morne Morkel thinks he's got Ben Stokes caught behind via an inside edge off the pad. The umpire says no, so South Africa review it. Joe Root tells his mate he's OK.

Image source, Getty Images

Joe Root is brilliant at picking up ones and twos - the type of player who is on 30 not out before you've even noticed he's walked to the crease. He's like water - if there's a hole/gap in the field, he'll find it. 

Jonathan Agnew
BBC Test Match Special

"I didn't think this morning that I'd be saying it's been South Africa's day, but you can't deny at the moment it is. They'd have settled for this with four wickets down. England really should have batted South Africa out of the match today."

Image source, Rex Features

Ben Stokes, with his sweat-soaked, tattooed muscles glistening in the sun, pounces when Chris Morris slides one down leg and the ball whistles to the boundary with nothing more than a firm push. The type of force which you'd apply to shut a stubborn freezer drawer. Good timing.

Morris is getting hot under the collar in the afternoon sun and returns one forward defensive with interest. Getting grouchy.

Image source, Andrew Hart

Andrew Hart: Spiritual home of Nairobi Nomads CC, the Limuru ground was built by farmers in 1926 and offers the unique experience of every player except for the batsman and keeper having to walk uphill to their positions. Batting in a bowl makes a great excuse for the odd agricultural shot!

Morne Morkel replaces Kagiso Rabada and he too keeps it tight. Just one from the over.

Image source, Michael Lumsden

Michael Lumsden: Stunning ground at Stonor (National Theatre CC vs the V&A 2013).

It's fair to say South Africa have got a decent grip on England's scoring rate here - they're 21-2 in the last 10 overs. Joe Root and Ben Stokes, as they've shown before, won't be kept quiet for too long though. Who will blink first?

Kagiso Rabada has a lovely fluid action and, combined with this natural athleticism, it's helping him to bowl at 90mph in his 17th over on a long, sweaty day in Cape Town. It feels as if South Africa are one wicket from really worrying England. Ben Stokes, for now, remains resolute and leaves well while playing straight to those homing in on the sponsor's yellow stumps.

If Chris Morris wasn't such a good cricketer, he'd make a decent headmaster. He's very stern in his demeanor, the cricketing Robert Huth. His grimace lengthens when Joe Root edges four through the slips. The irony being that Morris would have had a good chance of catching that if he was in the cordon. 

Michael Vaughan
Ex-England captain on BBC Test Match Special

"England consistently let teams they're up against back into the contest with some weak dismissals. Look at Durban - they went from 190-3 to 303 all out.  It happened in the UAE. Look back at the Ashes series and even New Zealand at Headingley."  

Image source, Rex Features

Ben Stokes, as many of his team-mates did before him, gets off the mark with a flick off his legs. 

Image source, AFP

James Gulleford: England throwing away a good position again. Same old problem, batsmen get in but can't go on to make big scores.

Simon Goodall: Sorry Taylor that's a shocker. Irresponsible first ball after tea.

Adam Lee: Here he is! Big old Calypso Collapso making his return into this England side.