The action begins where it left off at the end of series 2 - Steve and Susan have had an argument about their future, and Susan storms out of Steve`s flat in tears. The screen splits into two and we follow what happens to both Steve and Susan simultaneously.
Steve is suffering from a bout of hypochondria, thanks to the discovery of a mole on his bottom. This leads to a bitter argument with Susan, about how well the pair can remember each other`s blemishes.
Sally is terrified that she might be pregnant, so she takes a pregnancy test and asks the other girls to do the same so that she knows what a negative result looks like. In her fluster she gets the tests muddled up. One of the girls is pregnant, but which one?