If I were you, I'd go on eBay and just buy a load of dirt cheap books on Physics by various Physicists (as a bonus you can focus on topics that you are interested in). These will usually cover stuff done in A level and will often go way further too. Some people like to go for the "pop" physics authors like Cox, but if I were you, go for the well known people in Physics circles; like Feynman (dont go or his lectures though--they are better for referencing and are bloody expensive), Hawking, Einstein, Krauss, Weinberg, all are good (but go for what you are most interested in).
As an extra, Al-Khalili has some great books too that are easily accessible