In reply to BOOGA:
The BMC have this leaflet:
https://www.thebmc.co.uk/booklet-disability-awareness-in-rock-climbing
I think also, that physical disabilities covers a pretty wide range of people. Someone who is blind will have completely different issues to someone who has no legs. I think it is worth realising that it is a partnership, so involving the person themselves in any process. People are usually pretty good at coming up with ideas for ways of doing things which will work for their disability - they are usually experts in their own bodies. You will get ideas from them that you would never get without involving them.