A man, his lodger, a two-seater sofa and a supermarket loyalty card conspire to cause misery.

Vince is promoted to swimming instructor and begins to teach a would-be glamour model, much to her husband's annoyance. Meanwhile, Errol decides it's time to redecorate the bathroom.

After discovering a new cut price supermarket, Vince becomes rather keen on its own brand energy drink Blue Rat - all the energy of a rat trapped in a can. Meanwhile Errol realises one of his life ambitions of working with fish.