Susan's dragon-like mother is coming to stay and Ben is determined to avoid her. He concocts a plan whereby Roger will call and drag him off to a dental emergency. The plan works by the skin of its teeth and Ben heads straight for the refuge of Nick's flat.
Meanwhile Granny proceeds to make Susan's life a misery by complaining about everything from the colour of the bathroom to Michael's "condom basket". However an accident with the broken loo seat soon shuts her up
Ben arrives home from Nick's late at night. Feeling amorous in bed he attempts to get it on with Susan before realising that "Susan" is in fact "Granny". Running downstairs to find Susan sleeping on the sofa a mortified Ben tells her that "we very nearly became a Greek tragedy".
The following day Ben is instructed to tend to Granny while Susan goes out. However very soon he has fled and is back round Nick's. Michael, thinking that Nick's flat will be unoccupied and the ideal place to get down to some love action, then arrives with his date Fiona. Finally, her will having been broken by Granny, Abi turns up. It's now a full house at Nick's and he wants to crack open the Twister. But their fun is short-lived as Susan knocks on the door - she's cracked under Granny pressure too.
Later on Granny is enjoying the run of the house - her scheme to empty it of relatives having paid off handsomely. But what's this? Nick has come home. He says he will stay with her so she won't ever be lonely. This time it is Granny's turn to flee.
