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Lee’s roommate Kate has moved back to America and his best friend and landlord, Tim has put the apartment up for sale. Faced with the prospect of being homeless, Lee rents the spare room to Tim's ambitious younger sister Lucy (Sally Bretton, The Office). What he thought would be a simple solution quickly becomes, well, a bit complicated.

The new living arrangement is far from perfect, because even though Lee is now able to keep his well-meaning but utterly useless housekeeper Barbara (Miranda Hart, Hyperdrive, Lead Balloon), he finds himself in a bidding war with high-rolling Lucy for the apartment. Sibling rivalry becomes full-on anxiety as uptight accountant Tim quickly becomes suspicious of Lee's influence on his kid sister. To top it all off, Lee starts to seriously question the suitability of Lucy’s new boyfriend Guy (Simon Dutton, The Saint, Holby City).

Still unburdened by ambition or drive – although now the proud owner of an ice-cream van – Lee finds his plans for keeping the apartment are not smooth sailing. On the plus side, his new domestic set-up does lead him to discover the art world, the underworld, and the lengths one man will go for tickets to an England soccer game.