It was actually my hospital consultant who told me to get my drysuit - an experienced Ribber, he (rightly) believed that the inherent dryness and added warmth-enabling qualities of a drysuit would let me continue to use my SR4 in the face of osteo-arthritis.
Still has a couple of issues though - keeping hands and feet warm.
Hands - stopped using my Henri Lloyd neoprene gloves and switched to Sealskin (merely a tradename
) - layers of wool, breathable membrane and tough knitted nylon outer with gripped fingers & palms. Though designed for land-based outdooring, excellent on the RIB
Have still to find a solution to the warm feet issue - currently using layered socks under the latex boots with neoprene outer boots. Any ideas anyone?