Graduated from one of the early FC degrees a few years ago. I would really recommend it, but with caveats!
What others have said regarding maths etc - it's not too bad. I struggled with maths a lot at school, but was heavily into IT and computing in general. I think that's what saved me in the degree. Two or three modules over the course of the three years required a level of applied maths which I initially struggled with but I found did come more easily the more I did it. Examples for me were courses which taught you basic logic and problem solving - this is crucial for this degree and although it sounds scary, it is really simple stuff. It's easy to learn and easy to understand, but if you haven't before though about the world around you in that way it can seem downright scary.
From people who I was with on my course who had no previous IT experience (either at GCSE, A Level or otherwise), they did unfortunately really struggle. Even those who were strong mathematically did find some modules very hard. Some of the concepts in the 2nd and 3rd years are just foreign and alien to folks who haven't really used a computer in anger before. FC is not an easy course - it gives an in-depth view of Computer Science and then applies the theory there to real world scenarios. It is a good course - if you are confident with a computer (to such a level that reinstalling Windows, installing new hardware inside the case etc) then it will be a good few years for you - but if you have not previously had much exposure to more advanced functions of a computer then FC may be a bit too much too quickly..