Adapted from a play written by two Monty Python vets, this toothy satire launches with a tragic accident at Chumley's chocolate factory when hapless manager Ian Littleton accidentally knocks several employees into a huge chocolate vat. The tragic mishap at the chocolate factory results in candy lovers getting an unexpected 'extra' in their sweets.

Harriet Blossom is married to Robert Blossom, a businessman who'd rather spend the night at his bra factory than at home with her. One day, Harriet's sewing machine breaks, so Robert sends a repairman, Ambrose, to fix it. It's lust at first sight for Harriet, who convinces Ambrose to hide out in the attic for a tryst. When her new beau shows no desire to leave, the pair begin a years-long love affair right under Robert's nose.