A Conversation with Sean Lock and Mark Lamarr about the writing of 15 Storeys High.

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.

Inspired by the life of Gandhi, Errol decides to bring about positive change for the residents of Elderberry House. Meanwhile, Vince becomes rather taken with the icy girl from upstairs.

After ejecting a troublesome child from the swimming pool where he works, Vince is targeted by the local gang, who will stop at nothing in their quest to destroy him. Well - almost nothing.

Vince is accused of a crime that could have him facing jail, but an archaic legal loophole means he might get off. Errol is suffering from a bout of vertigo.

Vince falls for Stacey, the aqua aerobics instructor at the pool where he works as a lifeguard. Stacey thinks Vince is a bit weird until she sees his medical notes. Meanwhile, Errol has his own problems. He agrees to take part in a swimathon in aid of sick kids even though he can't swim. Vince decides his flatmate needs to conquer his phobia of saying "no".

Car-boot sales, pigeon droppings, illegal substances and ping-pong enthusiasts may, to the casual observer, seem somewhat unconnected. However, all four seemingly disparate elements converge in one day, resulting in quite an eventful and particularly miserable time for Vince.

Vince attempts to go on holiday leaving Errol alone in the flat with strict instructions not to water the plant. He heads to the travel agents to buy a ticket not caring where he goes as long as it costs £50 and takes off before 1.30pm. Things don't go to plan.

Vince applies for the job as manager of the swimming pool. Errol thinks his chances are slim: spilt beer on the application form and a lack of any qualifications whatsoever do not make him a particularly strong candidate.

Errol has become irresistible to the ladies and none of them believes his claims of having a girlfriend. He is also worried about Vince who seems depressed, so he contacts Vince's dad. Does Errol really have a girlfriend? Will Vince's dad come round? Will Vince let him in?

Vince wakes up surrounded by the debris of a night out. As his eyes focus, he spies a piece of pub furniture he took home ""for a laugh"". Errol is reluctant to help him return it for fear of being caught handling stolen goods and is unconvinced by Vince's explanation that it's not stealing if you're drunk.