ACS is a fantastic option and I think most people would recommend them over and above the big pilot factories. As Richard has mentioned, get yourself a class one medical and a trial lesson would be a good idea to see if flying feels right for you. I would personally go for the trial lesson first, partly because it's about half the cost of the class one medical. There's no point in paying £600+ for your medical IMHO, to then go on your first flight and find you don't like it or get air sick.
Definitely visit any schools you are considering undertaking training with and if possible, try and visit a few others as well which will at least give you a benchmark to base your opinions on.