Geoffrey Boycott
Ex-England batsman on BBC Test Match Special

It's easy saying they have enough and they should declare but it's not your reputation on the line. I'd like just a few more.

More spurious field changes - fielders swapping places while the field stays the same - ensures this will be the last over of the session.

Root plays out a maiden over - and strides off to the dressing-room, where no doubt he and coach Trevor Bayliss will reassess their declaration plans. The lead is 331 - England have added 79 this morning, rather less than the 100-120 Alec Stewart said last night that he hoped they'd get by lunch if they batted "proactively".

Geoffrey Boycott
Ex-England batsman on BBC Test Match Special

South Africa are not going to rush through the overs, they will just bowl what they have to - or slightly less than they have to.

Morkel's over seems to drag on even longer than normal, suggesting we'll only have time for one more before lunch.

It's a pretty dull and uneventful maiden over - so take a look at how Westley brought up his fifty:

Lunch is moving ever closer - Root shows his class with a deft late cut for two.

Andrew Samson
BBC Test Match Special statistician

The last batsman to make his debut batting at number three for England was Owais Shah, who made 88.

Geoffrey Boycott
Ex-England batsman on BBC Test Match Special

Well played, he deserves it. It's a psychological step in your career, you've got to get to fifty. Hundreds can come later, but I don't want him to give it away chasing runs.

Image source, Getty Images

50 for Tom Westleypublished at 12:51 British Summer Time 30 July 2017

12:51 BST 30 July 2017

Eng 151-2

Tom Westley reaches his debut Test fifty with a characteristic whip through mid-wicket for four. And a very understated celebration from the Essex man, for whom the milestone came from 119 balls.

Geoffrey Boycott
Ex-England batsman on BBC Test Match Special

When Westley goes to play through the off side he is sort of hanging back, that's the only thing I'd say about his batting. It's an area he should look at. He is a lot like John Crawley, who played some nice innings.

Image source, Reuters

Stephan Shemilt
BBC Sport at The Oval

Pigeon-watch. More adventurous, covering more ground today. Once they were huddled by the boundary, or tightly pecking at square leg. Now they are taking up a big space behind square, covering a lot of ground.

David Butcher: If England score any slower the pigeons in the outfield will start nesting. Rightly criticised at Trent Bridge but time to play shots now.

Maharaj, collar up in the style of Eric Cantona, spins down his second over to Root. In fact, "collar up" seems to be de rigeur at The Oval today - Root and fellow skipper Faf du Plessis both take that option. Two more singles added, the lead is 325.

Image source, Rex Features

Geoffrey Boycott
Ex-England batsman on BBC Test Match Special

I'd like to see Westley have more left shoulder, he still has too much bottom hand. He is very comfortable leg side but his off side shots could be improved. He wants to accept at Test level there will be a number of times when you are not able to score as quickly so you have to work a little longer for your runs. Don't give it away because of that.

Westley is watchful against Rabada, while Chris Morris has made a young fan's day by leaning over the boundary to add his autograph to the young lad's bat. A powerful cover drive from Westley's bat earns the Essex man a two.

Tim Hutchings: Westley doing a good job here - drop anchor and let Root / Malan / Stokes / Bairstow and Ali play their natural games.

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Now it's time for Maharaj, who's instead going to bowl from the Vauxhall End, with a slip in place, plus two catchers in the area I like to call Reasonably Short Extra Cover (ie shorter than "short", but not short enough to be called "silly"). Westley comes down the pitch aiming a leg-side heave, but drills it straight to mid-wicket. Eventually he guides a single to deep mid-on- there's 20 minutes until lunch, and the rain seems to have passed by.