Alastair Cook hits his 73rd first-class century for Essex against Gloucestershire
Yorkshire total 521 against Surrey; Lyth 183 and Tattersall 180 not out
England's Zak Crawley and Alex Lees out cheaply for Kent and Durham
Somerset's Lewis Goldsworthy out for 130 against Lancashire
Hampshire declare on 370-9, a lead of 153 over Warwickshire
Leicestershire's Callum Parkinson takes five wickets but Sussex total 588
Essex 199-1 v Gloucs 136
Alastair Cook moves into the 90s by driving spinner Miles Hammond square for his 11th four.
Two balls later a full toss outside off stump is despatched by Tom Westley and the over ends with a long hop outside leg which runs past the diving keeper for four byes.
Essex's first batting point is a single away.
Yorkshire 400-5 v Surrey
Jonny Tattersall flicks Conor McKerr away fine for four and then adds a single to square leg to take Yorkshire's total to 400.
They achieve the fifth batting point with 4.2 overs to spare. Tattersall is 121 not out and Adam Lyth has 171.
Kent v Somerset 365-8
Peter Siddle only lasts seven balls and Lancashire have two in two overs.
Second catch of the morning for Jack Morley running around from long leg.
Lancs v Somerset 360-7
End of a fine innings from Lewis Goldsworthy.
His maiden first-class century rescued his side from 105-4 yesterday and he's managed 27 more this morning.
Important wicket for Lancashire so things don't get out of hand.
But a lucky one as George Balderson's second ball of the day brings a leg side strangle.
Kent 30-2 v Northants 303
A second strike for Northants and Jimmy Neesham has the wicket.
A good delivery too, full of length and it straightens enough to catch a very health edge from Daniel Bell-Drummond that's well caught at second slip by Emilio Gay reaching up to his left.
Lancs v Somerset 351-6
Roelof van der Merwe has wasted no time at Southport.
He's swung Will Williams for six and struck consecutive boundaries off Tom Bailey.
Lewis Goldsworthy has extended his maiden century to 122 in the opening hour.
350 comes up for Somerset but an over too late for an extra point.
Essex 179-1 v Gloucs 136
If yesterday was tough for Gloucestershire, today could be even tougher, unless they can break this partnership very soon.
Only one run from the latest Miles Hammond over before Tom Westley turns his final delivery round the corner for four.
Westley is 79, Alastair Cook has 84 and they have so far added 172.
They hold the Essex second-wicket record against Gloucestershire - 222 on the same ground in 2016.
Yorkshire 379-5 v Surrey
Adam Lyth's driving was a delight yesterday, and there's another one as he finds the boundary at the start of a new Dan Worrall over.
Two balls later, the left-hander has a stroke of a luck as a big inside edge runs away fine for another four.
Lyth is now 165 not out, and Jonny Tattersall is still with him on 111.
Another wicket for Derbyshire at the Riverside as Toby Pettman bowls Scott Borthwick, playing no stroke, for 13, leaving Durham 34-3 in the 13th over.
Oli Carter and Delray Rawlins are continuing to build their partnership for Sussex, who are 465-4 against Leicestershire - with Carter on 70.
Notts have lost Ben Slater, bowled by James Harris for 31, but Haseeb Hameed is 33 not out in their score of 78-1 against Glamorgan.
Josh Baker has hit three boundaries at the start of his innings for Worcestershire, who are 153-7 and now just 35 behind Middlesex's first-innings total - Ed Barnard is now 54 not out.
Yorkshire 371-5 v Surrey
First boundary of the day at Scarborough and it's an easy one too as Jonny Tattersall puts away a leg-stump half-volley from Aaron Hardie.
Tattersall is now 109, Adam Lyth has 154 and the partnership stands at 246.
Abbott lbw McAndrew 19 (Hants 78-4 v Warwicks 217)
Hampshire's nightwatchman departs as Nathan McAndrew collects his second wicket of the innings for Warwickshire.
Liam Dawson comes out to join Ian Holland, who is now 38 not out.
Essex 170-1 v Gloucs 136
Image source, Rex FeaturesTom Price overpitches and Alastair Cook does little more than drop the bat on it to squeeze it into a big gap at cover and the ball runs away to the boundary. Cook is 80 not out, with Tom Westley on 74.
Middlesex 188 v Worcs 142-7
Ed Barnard dabs a ball from Tom Helm down to third man for a single and reaches 50 off 79 balls.
He's running out of partners, though, if Worcestershire are to achieve parity with Middlesex's first-innings total at Merchant Taylors' School.
Lancs v Somerset 328-6
It had been a confident start from Lewis Gregory with three boundaries.
But he's hooked Will Williams to long leg and Lancashire have secured a second bowling point with two overs to spare.
Durham 26-2 v Derbyshire 283
Martin Emmerson
BBC Radio Newcastle
It looks like a good day for bowling, under grey skies in Chester-le-Street. The lights are on, it remains humid and there's been a bit of rain about too.
Ben Aitchison, playing in his first Championship game of the season, got England opener Alex Lees lbw for seven with a delivery which nipped back in off the seam.
Durham were 10-1 at that point and 16-2 when nightwatchman Matt Salisbury edged Toby Pettman to the keeper on five.
It feels cooler than yesterday but is still around 21C and is muggy.
Yorkshire 364-5 v Surrey
We have play at Scarborough and Surrey pacemen Dan Worrall starts off with a maiden to Jonny Tattersall. There are 13 overs left for Yorkshire to earn that fifth batting point.
Hampshire 72-3 v Warwicks 217
Nathan McAndrew overpitches twice in three deliveries and Kyle Abbott eases both through the covers for four with a minimum of fuss.
Abbott is 19 not out, Ian Holland has 32, and Warwickshire are still waiting for their first wicket of the day.
Yorkshire 364-5 v Surrey
About 40 minutes has been lost but play is about to begin at North Marine Road. Adam Lyth will resume 152 not out, with Jonny Tattersall on 104.
Essex 153-1 v Gloucs 136
The Essex total passes 150 with five runs for Alastair Cook.
England's former captain pushes to mid-on and sets off for a sharp single, and a shy at the stumps runs away for four overthrows.
Cook may have been gone if that had hit - but instead he is 70 not out, and Tom Westley has 67.
Sussex are continuing their run spree against Leicestershire and are now 432-4 - with Oli Carter 58 not out and Delray Rawlins on 21.
Leaders Nottinghamshire have avoided early damage and are 47-0 in the 17th over, replying to Glamorgan's 318 all out, with Ben Slater on 31 and Haseeb Hameed 15.
Ed Barnard is only two runs short of a 50 for Worcestershire, but they have just lost Gareth Roderick, caught off Tom Helm for 23, and are 120-6 against Middlesex, still 68 in arrears.
There's been a second wicket for Derbyshire as Matt Salisbury is caught off Toby Pettman - Durham are 16-2, replying to 283 all out by the visitors.