Image source, AP

Tom Ford: Have all these runs devalued Stokes' knock in any way??

Second ball after the break and Bavuma signals his intent, mistiming a pull shot just over the head of Alex Hales. Sensibly he rotates the strike and Morris picks up a couple off Moeen Ali to end the over. The Proteas inside 100 behind now.

Bavuma and Morris didn't hold back before tea so let's see if they follow Michael Vaughan's advice and free their arms again.

Brews drunk, snacks eaten and they're all back out on the pitch. Let's resume.

Michael Vaughan
Ex-England captain on BBC Test Match Special

"South Africa should have a swing after tea and score as quickly as they can."

Duncan in Birmingham: As one of the problems in slowing a day's play down is the change between overs, is there an argument for reverting to 8-ball overs (perhaps reducing the overs to 75 in a day, 25 per session)?

Michael Vaughan
Ex-England captain on BBC Test Match Special

"The South Africa engine room looks back in form, which could make for a competitive series. It is just going to be whether they can get Dale Steyn fit and if they can take 20 wickets."

Richard Haines: Love the doom-mongers. England facing tricky fifth-day chase, on this pitch? No chasing needed batting third.

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

"When he came out to bat Amla was a man under serious pressure and South Africa were a team under serious pressure but he led from the front and played a beautiful innings. It was nice to see the England fans show their appreciation also."

Michael Vaughan
Ex-England captain on BBC Test Match Special

"I don't know why Nick Compton is shaking Bavuma's hand - he's only made 50!"

So the deficit isn't as low as the 75 Geoffrey Boycott predicted but Morris and Bavuma have made quick inroads. Their fluent partnership is worth 76 off 99 balls as the Proteas trail by 104 runs going into the final session.

Finn to give it one more blast as he gets a bit of movement away from Morris' tentative prod outside off. Bit of bounce too as Bairstow takes one at head height before Morris edges along the ground to the slips. A maiden but no wicket and this pair survive through to tea.

Michael Vaughan
Ex-England captain on BBC Test Match Special

"This is the first time I have seen England with a defensive field."

Ali keeps on twirling away from around the wicket, trying to cramp Morris, but the South African is happy to defend before taking a single off the final ball."One more before tea fellas," bellows Bairstow. Well, they have only a few minutes left to go.

Ben Thurley: England are in real danger here of a first-innings deficit and tricky fifth-day chase.

Andrew Samson
BBC Test Match Special statistician

"A fifty from 52 balls - that is Bavuma's fastest half-century in first-class cricket."

Bavuma's certainly solid in defence too, easily shutting down Finn as the England bowler tries to tease him outside off before guiding a couple down to third man. A dot ball to finish.

Michael Vaughan
Ex-England captain on BBC Test Match Special

Image source, Reuters

"It's a really nice innings from Bavuma. There has been some short stuff where he has pulled and cut and he's played some nice drives."

50 for Bavumapublished at 181 overs

181 overs

SA 522-6 (trail by 107)

Image source, Getty Images

Bavuma's got plenty in his locker, playing a deft lap sweep off Ali to deflect the ball through fine leg for four. He follows up by pouncing on a over-pitched delivery to drive through the covers for four before tucking a single into the leg side to bring up his fifty off just 52 balls with 11 fours.

Geoffrey Boycott
Ex-England batsman on BBC Test Match Special

"When England do get to bat I think Cook still has to open with Hales and just play. You have to try and get the shine off the new ball. If you try and whack it and you're three down for nowt you won't know whether to stick or twist."