Gavin takes over as trial manager fort he day as Brittas tests his abilities with intriguing problems.

Brittas insists on. compulsory urine drug tests for all his staff at the Whitbury Leisure Centre. However, the results would seem to reveal that Carole has been made pregnant by Colin after drinking a cocktail of hallucinogenic gases.

As Brittas packs in preparation for his move to Brussels, Helen decides she would prefer to stay at home and look after the dog. Meanwhile, Colin discovers a bomb at work - something he feels should concern Mr Brittas.