The wicket is covered by a green sheet, but that's the only thing shielding the square. There's drizzle in the air, but it's not really raining. Table Mountain has disappeared, swallowed by the pesky clouds.

Len Morrison: We may be hailing Bairstow and Moeen as heroes, but England threw away a winning position when we dominated. Much work ahead.

Geoffrey Boycott
Ex-England batsman on BBC Test Match Special

"If England get a solid top four then I think they can go to number one in the world. Their lower middle order is as good as any in the world. Cook and Root are quality but there are question marks over the other opener and number three."

Michael Vaughan
Ex-England captain on BBC Test Match Special

"South Africa have fought back well. Amla deserves a lot of credit for his innings, but you wonder what would have happened if England had held their chances."

Mike Bell: Cricket will die if two tweakers, bit of gloom, lights on,is deemed too dangerous. In an age of progress, do we age or progress?

England 159-6 - lead by 161

Overs: 65 - minimum of 31 left

Batsmen: Bairstow 30, Moeen 10

Fall of wickets: 17-1 (Cook 8), 19-2 (Hales 5), 55-3 (Root 29), 85-4 (Compton 15), 115-5 (Stokes 26), 116-6 (Taylor 27)

Bowling figures: Morkel 16-7-26-1, Rabada 13-2-57-1, Morris 12-4-24-1, Piedt 18-8-38-3, Elgar 6-2-10-0

South Africa first innings: 627-7 declared (Amla 201, Bavuma 102*)

England first innings: 629-6 declared (Stokes 258, Bairstow 150*)

Full scorecard

The covers haven't been pulled on, but there's no sign of that light improving. We're on stand-by for this game being officially consigned to the history books.

Image source, Rex Features

Rachel T: Jonny Bairstow is quietly cementing his place as an essential member of this team.

Yas: Jonny Bairstow for BBC SPOTY 2016 - you heard it here first.

Jonathan Agnew
BBC Test Match Special

"It feels as if that could be it, even if it isn't officially because the overs will start dropping quickly. England supporters are hailing Bairstow and Moeen as heroes. And the England dressing room looks like they think they've saved it, but it's not the end yet."

Image source, Rex Features

Jonny Bairstow checked with the umpires as he walked off, presumably to see if the match was over. It isn't yet, but it's hard to see how or why we'd go back on. In fact, rain has just started to fall.

The light has intervened and the players have been ordered off. I think Hashim Amla intimated that he was going to give the ball to Morne Morkel, so the umpires decided it was too dark. Deliberate ploy by Amla?

The umpires are getting together...

Image source, AP

We're breaking records for the speed an over can be bowled here. I reckon Dean Elgar might be able to get it down below one minute. Not great for the text commentator. It's still quite dark by the way.

Geoffrey Boycott
Ex-England batsman on BBC Test Match Special

"If I was England, I'd have batted on to 700. They were so much in the ascendancy. It's not right or wrong, just my opinion."

Image source, Reuters

If the two skippers feel that this game is done, they can shake hands when 15 overs remain. There's probably still an hour before that, unless the weather intervenes.Then again, the way these spinners are rattling through the overs, it might come a lot quicker. Piedt to Moeen. A maiden.

Geoffrey Boycott
Ex-England batsman on BBC Test Match Special

"I scored every time I batted, I counted every single one of my runs. I didn't need the scorer. Quite often I disagreed with the scorer. One time I got 170, but they had me down as 140."

Jonny Bairstow could well get 200 unbeaten runs in this Test and not be man of the match. Still Elgar, who shrieks when the edge is taken. Apart from that, not a great deal is happening apart from the players going through the motions. Perhaps petering out.

Let's say it is too dark to face fast bowling. If Cook declared now, then unleashed his pacers, would that be game over? Moeen is surrounded by four close catchers as Piedt comes round the wicket. Once more, the best beard in the match shows solid defence.