There are 37 overs left in the day. England will probably want to be no more than two wickets down at the close. It's beautiful in Centurion, blue sky with just the odd white cloud. Kagiso Rabada to Alastair Cook.

Thanks, Justin. Essential part of the cricket tea, the sausage roll. A cricket tea lives and dies by its sundries. Sandwiches a given, but what goes with them? Pork pies, scotch eggs are traditional. Some clubs have delved into the murky world of pizza, chips, even garlic bread. What a crazy world.

Stephan Shemilt, armed with a couple of sausage rolls, has just strode back to his desk. I think it's time for me to leave...

Kendall: Let's not forget, we've had the same two openers in all four Tests, in the same conditions and the one with the least runs isn't Hales. 

Flemming Jensen: It's been 7 innings. Please stop the nonsense.

Michael Vaughan
Ex-England captain on BBC Test Match Special

"Alex Hales will be sat in the dressing room with a cup of tea thinking he has missed out again. He looks in two minds at the crease, unsure whether to go for the full-on aggressive shot or a checked drive. Today he went for the checked drive and he skewed it to backward point."

Joel Fentem: Is there nobody in England that knows how to leave the ball outside off stump apart from Cook?!

Wayne Ellis: Hales fails again, on a track I'd fancy my chances on. Us winning the series shouldn't gloss over our obvious issues at opener.

Alex Hales has now scored 135 runs in seven innings in this series, at an average of 19.28, with a highest score of 60 and a strike-rate of 39.47.

South Africa's players will be enjoying their cuppa/iced water/energy drink much more than England's at tea, that's for sure. And whatever Alex Hales is supping, it is bound to taste pretty sour.

Andrew Samson
BBC Test Match Special statistician

"South Africa's 475 is the lowest all out total when three batsmen have made a hundred. The previous lowest was 494 by Australia v England at Leeds in 1926.

"Usually when a team has three centurions, they are not all out (only 30 of 150 occasions have they been bowled out), so the lowest in any innings is 393-3 by South Africa v England at Lord’s in 2008."

Rob: Surely one of the lowest totals with 3 centurions in an innings?

Michael Vaughan
Ex-England captain on BBC Test Match Special

"It's been De Kock's day - he has set up the game perfectly for South Africa with a splendid innings."

Dane Piedt, the off-spinner, has the honour of bowling the last over of the session. Cook, the archetypal accumulator, works off his pads to get off strike. Compton favours a straighter bat in defence. And that's tea.

Ben Prior: Hales has to be dropped and Zafar Ansari brought in. He bats with patience and leaves well outside off-stump! 

Rabada, his glare fixed on Compton as he stands at the start of his run-up, is a picture of concentration. Three slips, a gully and a short leg crouch expectantly. Compton survives. He's yet to score off seven deliveries. Time for one more over before tea.

Image source, Getty Images

Cook collects a brace of braces and finishes the over from Abbott with a leg-side single.

Image source, Getty Images

Australia coach Darren Lehmann has been treated in a Sydney hospital for deep vein thrombosis.

Cricket Australia chief medical officer Doctor John Orchard said: "DVT is not an uncommon condition and it is important to diagnose it early so that it can be safely managed."

Michael Di Venuto will deputise for Lehmann for the Twenty20 series with India.

Australia completed their one-day series against India in Sydney on Saturday, with the tourists winning the final match by six wickets.

Is that Alex Hales' penultimate Test innings? The likelihood is he'll get another chance in the second innings, but he can't be far off entering the last-chance saloon. One half-century in four Tests is not the return he - or England - would have wanted. Nick Compton is the new man. He has a silly mid-off for company.