Kathy Burke (who also has a hand in the scripts) plays Lynda La Hughes, who believes herself to be extremely attractive, stylish and irresistible, despite ocular evidence to the contrary.
Lynda's flat mate is Tom Farrell, a gay (and ever so slightly queeny) out of work actor. He and Lynda share the same taste in men, so his homosexuality is a thorn in her side (as she can't believe that given the choice, a man would choose Tom over her).