As I said, LSA doesn't exist in the UK - forget it for UK pilots for the next few years at least. It's an American concept, which gets talked about a lot in flying magazines, but has no force in British airworthiness. It might come along in a few years - but I would be surprised if it's more than a talking point for at-least the next 3 years.
Before I start writing a large essay: I could write a small book on the differences between those categories - could you expand upon what you're after - what sort of range of disabilities?, what sort of flying do they want to do?, does it include their learning to fly?, do they have existing qualifications?
G