not at all- you can get on to most degrees with mildly related subjects, you could do computing, ICT, physics anything like that... By the way, A-level maths really isn't too bad
A lot of universities I looked at for Computer Science require Maths (I'm studying it in September), but that certainly doesn't mean all do! This topic has came up before on TSR, maybe search the topic on the site or give these threads a read:
There are also many related degrees that aren't 'pure' Computer Science, but similar without the Maths, such as Computing Studies at Liverpool John Moores, which my brother does (and I know he didn't do A-level Maths and he is now on his placement year at Sony in Wavertree, Liverpool!).
These are just a few that don't ask for specifically Maths, but one thing you will notice is that, I think because the courses don't include a purely Maths element, the grade boundaries tend to be lower (BBC and below). This is fine if this is what you're aiming for, but if you're wanting to aim for a higher grade university for the prestige/reputation, or if you simply want to achieve higher in your A-Levels, then it's something to think about.