Surrey go to lunch on a nice round 100.

Rory Burns and Dean Elgar have batted superbly in overcast conditions.

The Essex bowlers will be frustrated with their morning's work.

An excellent morning session for Nottinghamshire comes to an end.

It was a slow start, but Kraigg Brathwaite (43 not out) and Ben Slater (55 not out) have climbed into the Yorkshire bowlers in the last half hour or so to stretch their stand past 100.

Image source, Rex Features

Rory Burns has just gone past 1,000 runs in the County Championship in 2018.

The Surrey left-hander has been a rock this season for the leaders, and he's unmovable in this first session at Chelmsford.

He's seven away from his half-century.

Ben Slater reaches his first fifty for Notts.

The opener, who joined from Derbyshire last month, gets there off 89 balls.

Nottinghamshire are dominant.

So, 10 or so minutes to go until lunch and Surrey and Somerset are both on top of their respective matches.

The top two are not prepared to give an inch!

Image source, Rex Features

Phil Waldon: Hmm, still no Rory Burns in the England squad!!

Yep, it's causing a fair bit of debate in our office Phil... is it last-chance saloon for Keaton Jennings?

• Sussex have lost their first wicket of the day against Leicestershire as Philip Salt is caught off the bowling of Ben Mike. He went for 44, just shy of his half-century, but partner Tom Haines is 32 not out. Sussex are 85-1.
• Kent are, um, collapsing: they are 68-4 against Northants, Joe Denly the latest to be dismissed.
• Gloucestershire have picked up the pace against Middlesex: they are 48-0, Miles Hammond Chris Dent the partnership closing in on a half-century.
• Derbyshire are, like Kent, looking a little nervy: they are 67-3 against Glamorgan.

Just to update you on proceedings at New Road... Hampshire are ticking along nicely.

After that flurry of early boundaries, Jimmy Adams has reined himself in. Oliver Soames has been there from the start.

Worcestershire will be desperate for another wicket before lunch.

Image source, Rex Features

Dean Elgar is some player to have coming in at three.

The South African moves up to 32 with a lovely clip into the leg side. It's his fourth four.

This is turning into Surrey's session.

England have just announced their squad for Friday's fifth and final Test match against India at The Oval.

Surrey's Ollie Pope returns after missing out at the Ageas Bowl, as does Chris Woakes.

Pope will play in the first two days of the match at Essex before joining up with England.

England squad:

Joe Root (c)

Moeen Ali

Jimmy Anderson

Jonny Bairstow

Stuart Broad

Jos Buttler

Alastair Cook

Sam Curran

Keaton Jennings

Ollie Pope

Adil Rashid

Ben Stokes

Chris Woakes

Dave Bracegirdle
BBC Radio Nottingham commentator

Nottinghamshire’s new opening pair of Kraigg Brathwaite and Ben Slater have made a promising start on their home debuts in the match against Yorkshire at Trent Bridge.

The pair have timed their acceleration perfectly.

Batting looked difficult under the floodlights and Slater was dropped on six off Jack Brooks.

37 runs have come in the last three overs though as the hosts look to post a formidable score after being asked to bat first.

• Another wicket has fallen at Kent: the hosts are 58-3 against Northants, Heino Kuhn trapped lbw by Nathan Buck.
• Sussex continue their impressive start at home to Leicestershire and are now 71-0 from 17 overs. There's a way to go yet, but at this pace, would you bet against Philip Salt and Tom Haines posting a century partnership?
• Goucestershire are inching onwards too: they're 23-0 from 16.2 overs against Middlesex.
• Michael Hogan is in fine form this morning for Glamorgan, having just taken his second wicket of the morning and disposed of Derbyshire's Wayne Masden caught by Tom Cullen. Derbyshire are 58-3.

While Somerset were picking up wickets at Taunton, Rory Burns played the most sublime of straight drives at Chelmsford...

Hello, that's spiced things up a bit at Trent Bridge.

After a sedate morning so far, Kraigg Brathwaite hits Matthew Waite for four boundaries in five balls.

A couple are streaky through slip, but the West Indian is still there with 30 to his name.

Well, not anymore, but rain has delayed play at Edbaston between Warwickshire and Durham.

The umpires carried out a pitch inspection at 11:30 BST and have suggested an early lunch followed by a 12:30 start.

They've lost 16 overs so far on day one, and here's why - look at those skies from the inspection earlier.