Actor Hugh Dennis (Alan): "He's a guy with almost no redeeming features. And he is dark. The briefing notes say he is a ‘Peeping Tom’. But the way I was trying to play him is a man dealing with ageing very badly. It’s what happens as you get older, and most people choose far more sensible routes like taking up drawing [laughs] but his frustration and melancholy turns to bitterness, which made him very interesting to me. He is angry with the fact that life is slipping away from him. It takes a sinister tone as his bitterness is focussed on the people being happy over the other side of the road, so he becomes obsessed with Becka."