My NCT class covered c-section and the teacher was very supportive and helpful when one girl was trying to decide whether to attempt a vaginal birth with her breech baby or planned c-section. She had the planned c-section (as I would have done without a second thought) but also cover homebirth for me as that was what I was planning.
I am an NCT contact for support for local parents and can recommend TAMBA from several mums who have used it. I'm sure you don't have to be a member to benefit from their support. Check out their website. They also have a Twitter feed.
You can also use the helplines provided by the NCT for the cost of the call (although membership for those eligible is just £2) and they have a line for breastfeeding support (they also cover formula feeding and mixed feeding), pregnancy and birth and shared experinces.
You can also join meetups of NCT, Netmums and you don't need to be a member to go along. Give your local family information service (google them in your area) a call too. They do lots of things which are not always that well publicised.
Can you ask your hospital for a tour of the unit before you have to go in? I can also recommend watching births on youtube to give you an idea of what to expect (just make sure you're looking at UK ones for hospital births as protcols can be quite different to US for example).
To be honest having a c-section is a lot more passive than a vaginal birth where you have to do stuff so a class is not going to tell you much other than what your consultant should talk you through, but things like baby care and other support would be useful so it might be worth going to some sort of class? I think you need to use your judgement for what's right for you.
Best of luck! 