Wells had Phil Bainbridge and Anderson Cummins caught at second slip by Phil Simmons and Chris Scott was lbw playing across a full-length ball.
Richard Montgomerie, this year's Oxford University captain, hit 151 - his maiden Championship century - as Derbyshire's decision to bowl backfired. He hit 24 fours in his 310-ball stay, helping Northamptonshire to a formidable 409 for 4 and shared a second-wicket partnership of 189 with Rob Bailey (93).
Mark Feltham took advantage of a green Old Trafford pitch to claim four wickets as Lancashire crumbled to 163 all out. Middlesex lost Desmond Haynes for a duck but Mike Gatting and Mike Roseberry compiled a half century stand before they fell in successive balls.Reuse content