Haseeb Hameed scores 117 for Lancashire v Middlesex
Alastair Cook makes just 11 on return to The Oval for Essex v Surrey
Gary Ballance scores 148 for Yorkshire v Hampshire
George Bartlett and Tom Abell make centuries for Somerset v Nottinghamshire
Middx 265 v Lancs 155-3
Hameed takes a single off the fifth ball of Dawid Malan's over and Rob Jones blocks the last.
A good fightback from the hosts with Tim Murtagh dislodging Guest and Maxwell in quick succession.
A tough session awaits both sides in 20 minutes.
Gloucestershire 110-3 v Derbyshire 291
Bob Hunt
BBC Radio Gloucestershire
Image source, Getty ImagesHaving dismissed Derbyshire for 291, Gloucestershire set off briskly in reply but were pegged back towards the end of the afternoon with a good spell from Tony Palladino.
James Bracey is still there at tea with a typically well constructed 64.
Miles Hammond was the first batsmen to go, caught at slip for 6 by Wayne Madsen, then Chris Dent and Bracey added 84 for the second wicket before Dent was bowled for 33.
George Hankins fell for a five-ball duck spooning to mid-wicket before Gareth Roderick joined Bracey leaving the home side 110-3 at tea.
Notts 263 v Somerset 309-4
Dave Bracegirdle
BBC Radio Nottingham commentator
Centuries from George Bartlett and Tom Abell led Somerset into a first innings lead on the second afternoon of their Specsavers County Championship match against Nottinghamshire at Trent Bridge.
The pair extended their fourth wicket partnership to 223 before being parted midway through the session.
At tea the visitors were on 309 for four, having taken an overall lead of 46.
Abell had reached his 5th first class hundred from 193 balls but then fell for 101, nicking Luke Wood behind after stroking 10 boundaries.
Bartlett also hit 10 fours in reaching the second century of his career, getting there from 158 balls.
The 21-year old went past his previous best score, of 110 and remains undefeated on 128, with Steven Davies on 22 not out.
Not quite the interval in all our matches, but here's a quick glance at how things stand....
Division One:
Ageas Bowl: Hampshire v Yorkshire 537-6
Trent Bridge: Nottinghamshire 263 v Somerset 309-4
The Oval: Surrey 395 v Essex 159-3
Edgbaston: Warwickshire 53-2 v Kent 504-9 dec
Division Two:
Chester-le-Street: Durham 224 v Sussex 62-5
Sophia Gardens: Glamorgan 570-8 dec v Northamptonshire 97-0
Bristol: Gloucestershire 110-3 v Derbyshire 291
Grace Road: Leicestershire 76-2 v Worcestershire 553-6 dec
Lord's: Middlesex 265 v Lancashire 154-3
Warwks 53-2 v Kent 504-9 dec
Image source, Getty ImagesA leg bye and a single to Sam Hain off the last over of the session, bowled by Matthew Milnes.
Another good session for Kent, who still lead by 451 runs.
Dominic Sibley has 16 and Sam Hain is on 10. Both batsmen need to go big.
Surrey 395 v Essex 148-3
Talk about confidence on your County Championship debut.
This is Essex batsman Rishi Patel ladies and gentlemen. Sit back and enjoy this cover drive....
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Notts 263 v Somerset 309-4
Fletcher bowls a maiden over to end the session and Somerset go into tea on a very healthy 309-4.
Great knock from captain Tom Abell earlier on today and a career best for George Bartlett - who will resume on 128 not out.
Warwks 50-2 v Kent 504-9 dec
Mitch Claydon drops short and Dom Sibley pulls through mid-wicket for four to take his team to 50.
A mountain still to climb, especially two down, but it's a start.
Yorkshire 537-6 v Hampshire
It's tea at the Ageas Bowl, but Yorkshire don't look like they're set to declare just yet.
They're now 537-6 off 160 overs with Jack Leaning unbeaten on 70 and Jonny Tattersall one shy of a half-century.
Middx 265 v Lancs 152-3 - trail by 113
Tim Murtagh has done it again!
More movement in evidence, but more off the inside edge of the bat of Glenn Maxwell as he leaves a gap between bat and pad, miscues a drive and edges the ball into his stumps.
Rob Jones to bat next.
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Middx 265 v Lancs 150-2
Superb from Tim Murtagh!
He gets one to nip back in off the Lord's slope and knock out the leg stump via the edge of the bat.
Brooke Guest is on his way to the pavilion.
Glenn Maxwell is the new batsman.
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The latest at Grace Road and Bristol...
Gloucestershire have declined to 103-3 at home to Derbyshire after looking well set at 96-1.
Two wickets to date for Luis Reece and one for Alex Hughes.
The hosts trail by 188.
Leicestershire are in trouble at home to Worcestershire, who declared on 553-6.
They're 68-2 and trail by 485 runs.
Josh Tongue and Charlie Morris have one wicket each.
Yorkshire 524-6 v Hampshire
Kevan James
BBC Radio Solent commentator
Liam Dawson has just become the bowler who has bowled the most overs in a single innings here at the Ageas Bowl.
Currently, he has the figures of 56-4-166-2.
He beats the previous holder of the record, off-spinner Shaun Udal, who back in 2001, the first season on this ground, bowled 55 overs against Sussex and claimed 2-167 with eight maidens
Notts 263 v Somerset 300-4
Steve Davies is settling in nicely here and drives Luke Fletcher through the covers for a single.
That's 300 for the visitors and still six wickets in hand.
Glamorgan 570-8 dec v Northamptonshire 87-0
Alex Winter
BBC Radio Northampton sport
It's a true sporting hub Sophia Gardens.
Behind the cricket ground sit a hockey pitch, football pitch and tennis courts.
To the side, the Welsh Institute of Sport - home of top-level netball among other events - and a bowls club. Rowing clubs use the River Taff.
And probably just as well. Because spectators here will be looking elsewhere for their entertainment. There is nothing at all on offer for the bowlers on this wicket and batting has been so straightforward.
But with a weight of runs on the board, it will take some time for Northants to move into safe waters.
At the very least, Glamorgan will hope to contain the visitors and prevent a rush towards the follow-on mark of 421.
Middx 265 v Lancs 150-1
Hameed is playing the short balls well and is up on his toes to tack Steven Finn away to square leg for one to go to 78.
Guest pushes another short one to backward point to take his team to 150. He's on 17 now.
Good batting from the visitors.
Surrey 395 v Essex 116-3
Image source, Rex FeaturesBreakthrough for Surrey at last and it takes a brilliant catch from Ollie Pope in the gully to dismiss Tom Westley.
Tom Curran the bowler who he tried to drive off the back foot, but Pope clings on above his head at pace to break that partnership.
Warwks 36-2 v Kent 504-9 dec
Liam Banks drives and edges low to Zak Crawley, who takes a fine diving catch at third slip off the bowling of Matthew Milnes.
Time for Sam Hain to have a bat.
There's live ball-by-ball cricket commentary from the Indian Premier League coming up shortly on BBC Radio 5 Live Sports Extra.
Kolkata Knight Riders host Delhi Capitals with Kent batsman Joe Denly lining-up for Kolkata alongside the big-hitting West Indian Andre Russell.
Tune in here should you wish to follow the action.
Notts 263 v Somerset 289-4
Steve Davies picks up his first boundary with a drive to the off side which evades Stuart Broad.
Four more to Davies through the offside, angling the ball away through the covers to take the lead to 26.