Hey there, i'm just about to start my 3rd and final year of Accounting & Finance at University of Kent. It's not the top 5 for this subject area but it's certainly not the worst either. They look for about 320 UCAS points these days which is about ABB/BBB so you do need to be quite intelligent to cope with this degree.
I can't speak for other uni's but my first year was far too easy.
I did Economics Mode A (which expands on what I learnt in A-Level economics), Financial Accounting 1 (which was also fairly easy if you have done A-Level accounting), Quantitative Methods for Business & Accounting (If you have done A-Level Maths then you will find easy), Business Law (the hardest module in the first year but i expect you won't need to do a law module at uni's) and an easy computing module.
For the accounting modules the need for maths is there, but you don't need to be a whiz at it. As long as you got a B or better at GCSE you should be fine. Some Uni's (like Kent) made Quantitative Methods module compulsory which made sure everyone was upto a decent standard of maths. Things like standard deviation etc.
The 2nd year was 10x more effort. The 2nd stage of the accounting module got much much more difficult and complex. Priniciples of Finance required a high-level of maths in order to do well. This built on what was learned in the 1st year in Quantitative Methods.
The other 2 modules were easier one of which (Management Accounting) also required alot of formulas etc. to be remembered which again, means that you need to be quite good at Maths.
As for the 3rd year, i've been told by many friends who have just finished this year that it usually is much easier than the 2nd year. Of course this could be totally different depending on which Uni you go to.
Obviously this degree doesn't require masses and masses of Maths skills but you would benefit greatly from having an A-Level in Maths. If you don't then i'm sure you are likely to find a couple of the modules quite challenging.
Hope this helps somewhat