Here we go then.

England need 473 more runs. South Africa 10 wickets.

Cook and Jennings stride out under blue skies. We've had three days of overcast bowling conditions, none of that today.

Image source, Reuters

Image source, AFP

It's also day four in the Test match between Sri Lanka and Zimbabwe with a similar challenge in order,

In their fourth innings, Sri Lanka require another 329 runs with nine wickets remaining for victory.

The score is currently 58-1 after 19 overs.

Follow the latest score here.

James Taylor
Ex-England batsman on BBC Radio 5 live sports extra

Joe Root will be banging on about positive thoughts in the dressing room. He'll mention that England posted the highest ever score in ODI cricket here and hold other records here. They're a talented team and they'll think they can do this.

Image source, Reuters

England's Ben Stokes, speaking to Sky Sports: "We can take a lot from yesterday. It was like we were in the sub-Continent. It was a slow-moving day but they still scored at 3.5 an over. We need to do something similar today."

Much like you there's some peculiar optimism in our office this morning.

"There's nothing in this pitch", "Philander and Morkel whacked it all over", "England to win by lunch tomorrow".

This is the challenge facing them. No side has got close to chasing the 474 England need.

Highest successful fourth innings run chases in Tests

1. West Indies 418/7 v Australia
2. South Africa 414/4 v Australia
3. India 406/4 v West Indies

Someone has got to beat those scores one day, right?

Stephan Shemilt
BBC Sport at Trent Bridge

Things I've learned watching England's morning kickabout: Jonny Bairstow is a decent footballer, Stuart Broad stands at the back and hoofs it, Jimmy Anderson goes down too easily and Alastair Cook has a 50p head.

I love the English cricket fan optimism.

I think it is clear that even if England are to lose this Test, many supporters want to see them fight it out until the final day.

Here are some survivals from relatively recent memory to boost the confidence even further.

Image source, Getty Images

Image source, Getty Images

Image source, Getty Images

Martin Strawson: Two days, a good pitch, good weather. It's a highly unlikely run chase. But you never know.

Bill Bows: What are the odds on England being all out by lunchtime? Or even better, 80-0 at lunch and all out by tea.

Jack Alex Turner: Prediction time: Um...pitch flattens, Cook (500 ball double century) & Wood to see us over the line at around 18:20 tomorrow.

One thing that will not save England is the weather.

It is set to be glorious all day in Nottingham.

Perfect batting conditions. What we worrying about?

Stephan Shemilt
BBC Sport at Trent Bridge

It's quite tricky to pitch a Monday fourth day of a Test. It's the start of the working week, so spirits aren't quite as jovial - there's no fancy dress, for example. However, there is a pretty decent crowd inside Trent Bridge. It's glorious, too. A day for batting.

Image source, Getty Images

And England's former skipper Michael Vaughan says Alastair Cook must emulate that legendary knock by Atherton if England are to save the Test.

"We just want to see some application for England's players to the situation now," Vaughan said. "They need to show some fight.

"You don't mention winning on day four. If Joe Root is honest he will want his team batting on Monday night.

"He will be saying let's not fold. Show personal pride, show how good you are as a player. If you take it to the last day maybe then you can talk about drawing, maybe winning."

Image source, Allsport/Getty Images

It's not the first time England have been staring down the barrel against the Proteas. In the second Test at the Wanderers in 1995 England were left with a fourth-innings chase of 477.

But Mike Atherton famously batted 11 hours, making a dogged 185 not out, with support from wicketkeeper Jack Russell. South Africa had five sessions to bowl England out, but were unable to finish the job.

Is there anyone capable of playing an Atherton-esque innings here at Trent Bridge?

Morning everyone. Welcome to our coverage of day four of this match.

From day two South Africa have dominated the Test and have put themselves into a position where all logic suggests they will win.

England's openers Alastair Cook and Keaton Jennings will return this morning, both still yet to score, with their side requiring the highest successful run chase in Tests for victory.

Both battled through a tricky four over period last night with Cook only surviving by with the help of the review system.

It is going to be backs-to-the-wall stuff but England have good memories of this sort of thing when they play South Africa.

Image source, Getty Images

All signs seem to be pointing to a South African victory.

The Proteas require 10 second innings wickets. England require a world record 474 runs.

But some special things have happened when these sides have met...