Coverage of Tuesday's three LV= County Championship fixtures, where Warwickshire dismissed Somerset for 340, Wayne Madsen hit an unbeaten century for Derbyshire and Stephen Peters and David Sales put Northamptonshire in a strong position.
7:15pm - Warwickshire survive their one over courtesy of nightwatchman Recordo Gordon and that is stumps. Here's the state of play in today's matches:
Division One
Watch the day one highlights from Derby
Derbyshire are279 for six, with Wayne Madsen unbeaten on 105, against Middlesex at Derby.
Warwickshire are nought without loss after dismissing Somerset for 340, with Craig Kieswetter hitting a brilliant 148 at Edgbaston.
Division Two
Northamptonshire end day one on 343 for five against Essex at Colchester following fine hundreds from Stephen Peters and David Sales.
7:06pm - Barker finishes off the Somerset innings, removing George Dockrell for his third wicket. Somerset are all out for 340.
6:55pm - Clarke strikes again! Three balls later he ousts Piyush Chawla; Warwickshire need one more wicket to end the innings.
6:52pm - Somerset are now eight down, with Alfonso Thomas caught behind off Rikki Clarke for four.
6:37pm - Kieswetter's magnificent knock comes to an end, two runs short of 150. Keith Barker has the wicketkeeper-batsman caught behind and, while he will be disappointed not to reach the landmark, Kieswetter's innings has dragged his side towards a very competitive total. They are 321 for seven, having been 65 for three when he came in.
6:21pm - Peter Burgoyne picks up five from the last over of the day and Derbyshire end on 279 for six.
6:15pm - And he is at it again! Milnes watches another huge Kieswetter hit go for six, before a single from the next ball takes Somerset to 300.
6:09pm - Kieswetter welcomes Tom Milnes back into the attack with two fours and a six! He moves to 133; Somerset are 293 for six.
6:02pm - Northamptonshireend day one on343 for five. 
5:55pm - Jeetan Patel strikes twice in three balls! The 33-year-old bowls Alex Barrow for 43 and then ousts Peter Trego for a duck. Somerset are 273 for six.
5:31pm - Heartbreak for Wakely as he falls one run short of a fifty. Monty Panesar's first wicket for Essex comes in his 30th over.
5:46pm - Madsen sends Tim Murtagh to the boundary to bring up a hundred. The 29-year-old faced 204 balls to reach three figures. But soon after his celebrations end, partner Tom Poynton is bowled by Murtagh.
5:29pm - Alex Hughes, taking part in only his second LV= County Championship fixture, departs for 33 after being trapped lby by Tim Murtagh. Derbyshire are 245 for five.
5:19pm - Wakely hits David Masters for three fours in an over to move to 48. Madsen sends Toby Roland-Jones to the boundary at Derby to move into the 90s.
On the two previous occasions Kieswetter has made centuries agaiunst Warwickshire in the Championship they've both been 150 or more!!
— Warwickshire CCC (@CricketingBears) August 20, 2013
4:58pm - Ben Duckett and Alex Wakely have taken Northamptonshire past the 300-mark, but 18-year-old Duckett is caught by Gautam Gambhir at slip off Reece Topley for 25 soon after.
Meanwhile Derbyshire's Wayne Madsen has moved on to 85.
4:45pm - The players head off for tea at Edgbaston with Somerset 231 for four.
4:38pm - Kieswetter smashes Jeetan Patel for a massive six and then picks up two doubles to record a century. Somerset were 65 for three when their wicketkeeper entered the fray and are now 227 for four.
4:19pm - Essex also make an early breakthrough after tea, and it's a hugely significant one. Sales is on his way back to the pavilion after being bowled by Graham Napier for a superb 131. England Under-19 skipper Ben Duckett is next man in.
4:15pm - Middlesex strike early in the evening session. Adam Voges' third over of the contest delivers his first wicket, as Richard Johnson attempts a loft over mid-on but can only pick out Harris.
4:10pm - Derbyshire and Northamptonshire have both returned to the middle after their respective tea breaks.
Craig Kieswetter has now completed 5,000 first class runs @SomersetCCC
— Warwickshire CCC (@CricketingBears) August 20, 2013
3:50pm - Derbyshire take tea on 174 for three . Madsen remains unbeaten on 64.
3:45pm - In the Yorkshire Bank 40, Lancashire Lightning are set to post a total in their clash against Hampshire Royals at Emirates Old Trafford. A report will be available on ecb.co.uk later.
Tea is taken at Castle Park, with Northamptonshire 258 for two .
3:32pm - Just two balls after Kieswetter celebrated his half-century, he sees Hildreth depart at the other end, caught at slip off Tom Milnes. Somerset are 154 for four.
3:27pm - Kieswetter hits Keith Barker to the boundary three times in the same over, the last of which moves the wicketkeeper to 50.
1000 - When reaching 49 today, @DerbyshireCCC 's Wayne Madsen became the first batsman to score 1000 @LV_Cricket runs this season. Landmark.
— OptaJim (@OptaJim) August 20, 2013
3:05pm - Peters only needs three more deliveries before recording a hundred, but he departs two balls later. David Masters finally breaks the second-wicket partnership, which added 205 runs to the total.
3:02pm - After 18 dot-balls, Peters takes a single to move to 99. He will be hoping his next single does not take as long to score.
3pm - Wayne Madsen follows up celebrating reaching 1,000 LV=CC runs for the campaign by reaching a fifty with a seventh boundary of his 95-ball knock.
WICKET: Chanderpaul is out for 2, caught at short leg by Robson off bowling of Rayner. Derbyshire 123/3 #MiddxvDerbys
— Middlesex Cricket (@Middlesex_CCC) August 20, 2013
2:44pm - But Slater's watchful innings has come to an end! Harris has him caught behind by wicketkeeper John Simpson. Shivnarine Chanderpaul is next man in.
Stephen Peters takes a single off Greg Smith to take his partnership with Sales to 200.
Somerset pair James Hildreth and Craig Kieswetter have returned to the middle at Edgbaston following the lunch break.
2:20pm - David Sales completes his 28th first-class ton. It took the 35-year-old 133 balls and he brought up three figures with his 17th four of the innings. 2:24pm - Ben Slater passes 50 with a four off James Harris. The Derbyshire opener has scrapped his way to his half-century, taking 128 balls. His efforts continue to frustrate Middlesex, who would have hoped for more than one wicket by now after electing to field this morning.
2pm - Somerset reach lunch 107 for three at Edgbaston.
MILESTONE! Congratulations to Wayne Madsen who has reached 1,000 first-class runs in 2013. Well batted Mads! #P2bD pic.twitter.com/856RuA2NwU
— Derbyshire CCC (@DerbyshireCCC) August 20, 2013
1:44pm - The afternoon sessions are under way in Derby and Colchester.
1:25pm - A big wicket for Warwickshire, as Trescothick is removed four runs short of a fifty. Jeetan Patel has the former England opener taken at slip with his third delivery of the day.
1:15pm - Chris Jones is caught in the gully off Tom Milnes, reducing Somerset to 52 for two.
1pm - We have reached lunch in the 11am starts, though play continues at Edgbaston where Somerset are 52 for one. Here’s a summary of the state of play:
Division One
Derbyshire are 91 for one at lunch, after being asked to bat by Middlesex .
Division Two
Northamptonshire are 147 for one after choosing to bat against Essex .
12:43pm - Sales completes a fifty to move Northamptonshire to 137 for one. He raced to 39 from as many balls, but the final 11 runs needed another 24 deliveries.
12:29pm - Derbyshire have upped the scoring rate somewhat, scoring 22 off the last two overs. Slater is unbeaten on 30, while Wayne Madsen has reached 21 off 17 deliveries.
Darren Maddy not at the ground yet, on his way having been named as a late replacement for Jim Troughton. Porterfield is subbing for him
— Warwickshire CCC (@CricketingBears) August 20, 2013
12:18pm - It's a good start for Warwickshire as Compton falls for six in the fifth over, trapped lbw by Keith Barker. Somerset are 23 for one.
12:11pm - Peters sends Panesar to the extra-cover boundary to complete a half-century and take his side past the 100-mark. Sales might not be too far behind him, having raced to a run-a-ball 39.
12:08pm - Gareth Berg makes the breakthrough for Middlesex. Hughes is the man out, holing out to Toby Roland-Jones at mid-on for 16.
12pm - Play has started at Edgbaston, with Marcus Trescothick and Nick Compton at the crease.
Monty Panesar's first over for Essex costs three runs.
11:56am - Derbyshire and Northants are taking different approaches this morning. The former have reached 33 without loss at the end of the 13th, while the latter have just hit their 12th boundary of the innings and are 72 for one from 14 overs.
The 50 is up for Northants, for the loss of only 1 wicket after just 11 overs. Peters is on 30 and Sales is on 12 #GoSteelbacks
— Northants Cricket (@NorthantsCCC) August 20, 2013
11:41am - In the third game of the day, Somerset win the toss and choose to bat first .
11:30am - Northamptonshire have, in fact, slowed their scoring down. David Masters records the first maiden of the innings at the seventh attempt.
Derbyshire are 16 without loss after eight overs at Derby.
11:18am - Another 10 runs followed in the next over, but Middlebrook is bowled by Masters in the fifth. Will that slow down the Northamptonshire charge? It appears not. David Sales sends the first ball he faces to the boundary for four more. They are 31 for four.
11:11am - Northamptonshire are looking to get a move on with things this morning. David Masters' second over of the day costs 13 runs, following three boundaries and a single.
FOUR! @ChesneyH22 (4*) off the mark with a beautiful straight drive off Roland-Jones. Derbyshire 4-0 (2 overs); @BennySlats 0*
— Derbyshire CCC (@DerbyshireCCC) August 20, 2013
11am - We are under way in the first two games of the day. Ben Slater and Chesney Hughes are opening for Derbyshire while Stephen Peters and James Middlebrook are out in the middle for Northamptonshire. Play starts at Edgbaston in an hour.
10:52am - Elsewhere today, England Women are playing Australia Women in the first Ashes ODI, which can be streamed live here , England Lions begin their series against Bangladesh A and Lancashire Lightning host Hampshire Royals in the Yorkshire Bank 40. Reports from these games will be available on ecb.co.uk this evening.
10:45am - Derbyshire will bat first after Middlesex won the toss and elected to field.
Northamptonshire choose to bat at Castle Park , against an Essex side who include new signings Gautam Gambhir and Monty Panesar .
10:37am - Middlesex are 14 points off the top of the table and will see a win away at bottom-side Derbyshire as vital if they are to lift the trophy.
Reigning champions Warwickshire still retain hopes of keeping their crown, and face a Somerset scrapping to avoid the drop into Division Two.
Both Essex and Northamptonshire are looking to go the other way. Northamptonshire are currently in second, 29 points ahead of their opponents but having played a game more. Essex know a defeat could all-but end their chances of promotion.
10:30am - Hello and welcome to the return of the LV= County Championship. The teams have had a break from the four-day format, with Friends Life t20 and the Yorkshire Bank 40 taking over, but today sees the start of a busy week of action.
We have three games starting today. They are:
Division One
Derbyshire v Middlesex, County Ground, Derby. 11am
Warwickshire v Somerset, Edgbaston. 12pm
Division Two
Essex v Northamptonshire, Castle Park, Colchester 11am