Tim Hancock, 20, and Justin Vaughan, on the shortlist for the New Zealand World Cup squad, put on 141 to help Gloucestershire from 113 for 6 to 346 all out at the close. Hancock fell for 82, one of four wickets for David Capel, while Vaughan was a run short of his maiden Championship century.
Devon Malcolm weighed in with 5 for 45, his best of the season, as Derbyshire dismissed Glamorgan for 170 at Chesterfield, the home side ending on 93 for 2; and Richard Stemp, Worcestershire's slow left-armer, took five wickets for the third time this summer in Somerset's 293 for 9 at Weston-Super- Mare. South African Richard Snell top-scored with 75.
Mark Nicholas won the final first-class toss at Bournemouth and made his best score of the season, 95, in Hampshire's 341 for 8 against Middlesex. Jon Ayling and Adrian Aymes added half-centuries.