Chris Woakes' defiant 80 ensured Warwickshire warmed up for their bid to complete a double by holding off a late Nottinghamshire charge and claiming a draw in the final match of their campaign.
Allrounder Luke Procter shone during a low key final day of Lancashire's dismal season with the first seven-wicket haul of his career
In-form Durham finished their campaign with a fifth win in six games after beating Sussex by five wickets with a day to spare.
Steven Mullaney enhanced Nottinghamshire's chances of finishing on a high with a victory over county champions Warwickshire with a fluent 94 - his highest first-class score since May 2010.
Nick Compton boosted his chances of England selection with a timely century as Somerset tightened their grip on Worcestershire at Taunton.
Newly crowned champions Warwickshire bowled out Nottinghamshire for 155 before their own batsmen also endured a difficult day
Abdur Rehman weaved through Worcestershire with 9 for 65 to leave Somerset wondering how close they could have got to the title
A fluent unbeaten 76 by Ben Brown and superb bowling by Steve Magoffin helped Sussex to step up their bid for second place in the County Championship
Warwickshire director of cricket Ashley Giles talks about his eventful journey with the club, during which they went from rock bottom to county champions, and his England aspirations
After Lancashire won the 2011 County Championship, a member of the Old Trafford staff bought a copy of every national daily newspaper. Relegation means there will be no repeat this year
Jim Troughton has admitted that the pain of missing out on the Championship title in 2011 played a large part in pushing his side to go the extra step in 2012
Surrey played like a team that wanted to end their last match at home on a high and did so with a chilled 195-run victory
Surrey dropped their England wicketkeeper Steve Davies from the line-up for their current match against Nottinghamshire because of a "lack of form"
Lancashire will finish a season they entered as defending champions with relegation to Division Two after Surrey's victory and their own defeat
Somerset surged to a five-wicket victory over Sussex that gives them the opportunity to steal the runners-up position in Division One at the last
Two of the architects of Warwickshire's 2012 Championship triumph were former Essex players: Chris Wright and Varun Chopra
Warwickshire secured their first County Championship title since 2004, taking less than half the third day at New Road to take the remaining eight wickets in Worcestershire's second innings
If you look at this day in isolation, Surrey had a good day. If you look at it in the context of the whole season, they should have done better
Lancashire's bid for Division One safety looks set to be reliant on Surrey failing to beat Nottinghamshire after failing to take control against Middlesex
Four wickets in five overs at the end of a keenly contested day almost put hopes of a surprise Somerset victory to bed
Lancashire, desperately trying to stave off relegation a year after winning the Championship, made amends for a sloppy first day in the field with a professional display with the bat at Lord's.