When Mum finds out that Dad didn't throw away his old boxes of science magazines in their clear-out, she goes mad. So Dad builds a bonfire and promises he'll burn them all. But Dad is only pretending to burn them, instead squirrelling the boxes off to his shed in the garden.
Mum is excited as her best friend, Val, is popping around with her new dress for her daughter Karen's wedding. Adam and Jonny are convinced Karen has a face like a foot. Meanwhile Jim's dog, Wilson, goes missing, leaving Jim distraught.
Later, Val comes round. She looks just like Mum: similar hair, similar clothes and - according to Dad - "similar bottoms". She tries on her dress. The men are instantly bored.
Will Jim ever find Wilson, and will Mum venture once again into Dad's shed to discover the truth behind his "pretend bonfire"?