Apply ASAP. If you apply after the deadline then applications are done on a first come first served basis. The longer you wait the less likely the uni will help him find a place.
At this stage I'd say a place on campus is unlikely. If he does get a place it will be for Westwood sharing (you share a room with another person for the first few weeks - one will then have to move out to 'no shows' on campus or to places off campus. However the uni manage off campus accommodation (mainly at Liberty Park in Cov, also individual houses) and if you end up here the uni might give a free bus pass for the year. Make sure the application is done before A level results - clearing is coming up soon and the later he leaves it the worse the situation. Applying in late August/early September will probably mean he will have to find his own accommodation. But applying now might mean the uni will help out.