While Yorkshire's bowlers toiled throughout a wicketless afternoon at Canterbury yesterday, Michael Vaughan ruled himself out of a comeback in next week's Roses match after admitting that he had recently suffered a slight setback in his rehabilitation programme.

Vaughan, who has temporarily left the Yorkshire camp to continue his training with England at Lord's, said it would take another week or so to get a little bit nearer playing.

Darren Lehmann was on 176 when he continued his record-breaking innings against Kent but his body had stiffened up noticeably after his epic batting of the previous day and when he had reached 193 he tried to hit Simon Cook through mid-wicket and his rusty shot went straight to Rob Key at mid-on.

His effort was spread over 317 minutes and contained 25 boundaries and when he hobbled back to the pavilion he had taken his tally of Championship runs this season to exactly 500 in five innings.

Tim Bresnan remained determined until he had batted for two-and-a-half hours for his 33 at which stage he became one of four batsmen to have their stumps knocked over by medium pacer Darren Stevens, who claimed career-best figures of four for 36, and Yorkshire were all out for 382.

Kent have quality openers in Key and David Fulton and both made sure but agonisingly slow progress in the afternoon session when they added only 92 and each completed his half-century.

Their opening stand was worth 153 when Key fell and Fulton moved steadily to 75 off 207, but aimed a cut at Richard Dawson and was caught behind to bring the off-spinner his first wicket of the season from 65 overs at a cost of 257 runs. Lehmann hogged the limelight again trapping Cook lbw, Kent closing on 196 for three.