Trescothick runs the Somerset show

Yorkshire Bank

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Gareth Cross & Marcus Trescothick

Marcus Trescothick takes the Lancashire attack to task as he races to a match-winning 69-ball century. Both he and Somerset were unbeaten

Somerset and Surrey maintained their immaculate records in the Clydesdale Bank 40 thanks to convincing victories today.

Marcus Trescothick’s savage unbeaten 111 off just 79 balls – his hundred spanned a mere 69 – trumped Steven Croft’s 107 and propelled Somerset to a seven-wicket mauling of Lancashire in Group C at Taunton.

Trescothick was assisted by 32 from Peter Trego, James Hildreth's 37 off 27 deliveries, and Jos Buttler, who contributed a rapid unbeaten 51 to an unbroken fourth-wicket stand of 80 that saw Somerset overhaul a far from insignificant target of 249 with eight overs to spare.

They remain top of Group C after five wins in five games, while Group B leaders Surrey boast four in four after seeing off Scotland by 48 runs at the Grange in Edinburgh.

Scotland never came close to challenging a total of 257 for seven which was built around Matthew Spriegel’s 82 not out, Steven Davies (40 off 28 balls) and Jason Roy (52 off 36) having supplied the early impetus.

Durham moved level on points with Northamptonshire, who were not in action today, thanks to a seven-wicket win over Hampshire at the Emirates Durham ICG.

Gordon Muchall took his run tally to 264 in four games courtesy of an unbeaten 66, carrying Durham to their target of 162 with 20 balls to spare alongside Dale Benkenstein, who made 60 not out.

Ben Stokes earlier grabbed four wickets for Durham, while Dimitri Mascarenhas marked his long-awaited return from injury with three for Hampshire.

Will Porterfield and Varun Chopra’s opening stand of 189 all but confirmed Warwickshire's eight-wicket triumph over Leicestershire at Grace Road.

Dean Cosker, Stewart Walters & Graham Wagg

Dean Cosker, left, takes the acclaim after removing Chris Taylor, one of his four wickets - at a cost of just 30 runs - to help set up Glamorgan's triumph over Gloucestershire

Porterfield hit 95 and Chopra 86 to break the back of their pursuit of a modest 206, having seen Darren Maddy respond to Kadeer Ali’s run-a-ball 60 by claiming 4-29 and a run-out.

Sussex knocked Derbyshire off top spot in Group A after strolling to a seven-wicket win at the PROBIZ County Ground, Ed Joyce hitting 90 and Chris Nash 78 – they put on 161 for the first wicket – to help chase down 197.

Wes Durston’s 85 for Derbyshire proved to be in vain as Sussex cruised home with 9.5 overs left.

Yorkshire slipped to a third defeat in four games, losing to Kent by two wickets in a thrilling encounter at Headingley Carnegie.

Ajmal Shahzad smashed an unbeaten 59 off 34 balls to carry Yorkshire to a challenging 230 for seven, but he conceded five fours in an over as Kent recovered from 137 for five to win with two balls remaining.

Shahzad failed to deny Kent the four runs they needed off the final over, Martin van Jaarsveld’s 74 off 65 deliveries having done much to maintain Kent’s hopes.

Back in Group C, Nottinghamshire opened their account with a seven-wicket victory over the Unicorns, who remain without a win in five attempts.

Michael Thornely’s 97 helped the Unicorns to 200 for four at Wormsley, but Samit Patel made 50 and Adam Voges completed the job with 6.3 overs to spare as he compiled an unbeaten 60.

Figures of 4-30 for Dean Cosker and Gareth Rees’ 59 not out – his third consecutive CB40 half-century – helped secure a four-wicket success for Glamorgan at the expense of Gloucestershire.

Despite Will Gidman’s unbeaten 40, Gloucestershire's total of 154 for eight at the SWALEC Stadium was never likely to test a Glamorgan side who have now won their last two games.