Haven't heard of an A Level in Photography (probably just my ignorance) but if you wanted a career in Photography then a National Diploma is along the same lines. You can enrol on a National Diploma (ND) in Photography so long as you have at least a 'C' in Maths and English. Least thats how it is right now for a few colleges in my area but I think every college has a different take on 'what you need to get in' but it'll never be anything higher than needing a C in English and Maths. I'd suggest you get at least a C in Maths and English. Anything else doesn't really matter but hey, you never know, you might need at least 5 Cs for some colleges so it don't hurt to try. For me, it didn't matter (but I still had the grades as backup) but I think it all counts towards getting into Uni so you may aswell give it a shot.
Look around some colleges and I'd suggest doing a two year National Diploma in Photography. I did an ND in Graphics and then decided I liked Photography more than the graphical side but because its a slightly related field and I've got a few "decent" portfolio shots, I'll be able to latch onto a Higher National Diploma or a HNC course in Photography anyway. You'll pass the ND, go on to do another 2 years with HND or HNC and then maybe a Degree at Uni in Photography, Photo Journalism or whatever you feel like. But plenty of people land jobs after the HNC or HND course and some even after the ND. Hell, my tutor at college was in the middle of a HNC course while he was doing wedding photography and teaching photography so you don't necessarily need the grades to make it. Although it obviously helps in certain situations and having the contacts from Uni helps a great deal.
I'm rambing... but nah, you don't need any background qualifications to get onto Photography courses at college so long as you've got a basic understanding of English and Maths like I said above.