Does anyone know where I can get a list of possible A-levels to do in England?

I've already done my AS year of sixth-form, but I feel I have the aptitude to take another A-level in my next year. I've looked around, and I personally can't seem to find anything, but I was wondering if anyone knew where I'd be able to find a comprehensive list of ALL A-levels there are possible to do in the UK, specifically England. My school doesn't offer many, and I've only just recently found that there are highly obscure courses available which I never even knew existed! To anyone who can help, thanks in advance, I really appreciate it!