I would advise against doing Photography as an A-Level because a lot of Universities are discounting 'soft' subjects (Drama, Media, Law and so on). They score low on the points chart so you might find it a handicap.
You should also be aware that Universities offering Degrees in Photography are of two sorts: old and 'new'.
The old Universities offer Photography BA usually as a technical academic subject which is probably not what you want.
The 'new' Universities used to be Polytechnics and still behave as such with the result that their courses tend to be crap.
The 'traditional' route is to take Photography as an Art subject which means doing a Foundation Course in Art at an Art College and then going on to do a 3 year Vocational BA at another Art College.
Foundation Courses are run by most local Colleges and give you a basic grounding in all disciplines. Art Colleges tend not to accept students that have not done a Foundation.
Taking that route does mean, however, that A-Level Photography becomes a viable option.
You have to judge Art College courses by reputation, who they have as visiting lecturers and the 'feel' of the place. If you don't like it don't go.
Bournemouth used to be the best (still good for film) but it went downhill in the late 80's/early 90's. Still has some reflected glory and has some very successful old boys.
Swansea, Brighton and Bradford have all been good in their day. As was Derby (John Blakemore still has connections with it).
Manchester Metropolitan does some interesting visual Arts course - well worth checking out (Paul Blatchford used to be in charge there but I'm not sure he still is).
PS You can't get a loan or a grant for a Foundation course - yo have to come up with the cash. Course fees vary from College to College. My eldest is currently doing a Foundation and it is costing me about £5,000 - but that includes over £3,500 for accommodation.