Great performance by Keeley Hawes in the last episode, portraying Ritchie's mother, Valerie, who I think always knew deep down that her son was gay, but clung to the slightest hope that he was at least bisexual and would settle down with a girlfriend, so she never openly admitted the reality to herself, preferring delusion. When Valerie is forced to confront the reality of Ritchie's homosexuality, the fact he's got AIDS, and Sandra's mocking about her (Valerie) not knowing about Ritchie being gay, Valerie can't delude herself anymore and becomes nasty.