Mark's ray of sunshine, object of desire and friend at work. Sophie is too bright and interesting for her job and most of her colleagues. In Mark she recognises someone who is on her wavelength. Trouble is he's such a bag of neuroses he manages to self-destruct as soon as things start going well.

As the series progress Sophie starts to spread her wings. Before long her latent desire to find something more in life than a job in a loans company and a ready meal with her boyfriend starts to put strain on her and Mark's relationship. Despite their problems when she finds an engagement ring in Mark's draw she instantly accepts his proposal - the only problem is Mark is too embarrassed to tell her that didn't actually want to propose!