Durham Questions

Are you allowed to apply for more than one subject? I want to apply for Psychology as my first choice, so my Personal Statement will be all about that. I'll also put Psychology in other places in my UCAS. I'm going to put Anthropology and Sociology joint honours as my backup. Will I get an offer for it if I right all about Psychology, with the occasional hint at other social sciences? Am I even allowed to apply for different subjects at Durham? If I apply to both courses at the same College, will that hinder my application?