Dudley invents a new board game, Heart Attack, which he thinks will be a hit with vegetarians. He himself claims to have seen the light, having been convinced by Mr. Adams, the greengrocer. Whilst Muriel tucks into a cholesterol-rich steak followed by treacle pudding with double cream, her husband struggles with organically grown alfalfa sprouts, goats cheese on stone-ground whole bran biscuits and prunes with a sunflower seed as a treat. Meanwhile, Susan is having problems ejecting a troublesome boyfriend, Blackie [so called because he has a black belt in karate], from the ground floor flat. She enlists the help of her father, but Dudley gets rid of Jacqui's Negro boyfriend, James, instead. It then transpires that Blackie could be Dudley's natural son by an old flame, Betty Corkindale.