Ida and Millie are working in the Oxfam shop,where Millie is pleased to see a better class of customer. Gillian feels sorry for Wilmot,whose wife has left him and is being pursued by WPC Whatmough,so she invites him,along with Rosie,for a meal at her parents' house where Wilmot causes havoc with her father,Bill's, DIY efforts. Worse is to come when myopic copper's nark Merv arrives at the house and Bill innocently asks him to carry a mirror upstairs,resulting in seven years' bad luck all round.

Rosie and Wilmot are at the local amusement arcade looking for runaways when they are invited upstairs for drinks by the local entertainment entrepreneur Big Cyril and meet his glamorous trophy wife Liz. Wilmot is smitten by Liz and neglects work as a result. Meanwhile Gillian gives WPC Whatmough a beauty make-over in her efforts to attract Wilmot but Wilmot has gone after Liz,who is working at her husband's funfair and he is literally carried away.

Gillian tries to form a foursome to get Wilmot and WPC Whatmough together but Wilmot is still smitten with Liz and persuades Rosie to meet her in a bar to put in a good word for him. Rosie duly turns up but finds that Liz regards Wilmot as totally ridiculous though she is attracted to Rosie and lets him know it. This does not go down well with Gillian though,strangely,WPC Whatmough and Wilmot appear to be getting it together.

Gillian is still unforgiving of Rosie after hearing about the affair with Liz and punishes him and Wilmot when they come to apologize,calling the engagement off. Whilst Ida presses a reluctant Norman to lay claim to the best donations to the Oxfam shop Rosie and Wilmot take the inspector to the park where Merv has assured them loot has been hidden in the boating lake but this too ends in disaster.

Rosie is still trying to beg Gillian's forgiveness though she responds by cutting his police helmet with her garden shears. Then Rosie and Wilmot are called out to bring down an aggressive Scottish drunk who has climbed onto a roof,attracting a large crowd,including Gillian and her parents and Rosie's family. The lads get themselves into rather a mess and are eventually rescued by WPC Whatmough but Gillian now sees Rosie as a hero and all appears to be forgotten.