Thanks for the swift reply I will probably start with a stirrup pump, ideally as part of an outfit, but have been a scuba diver for 20yrs, so have plenty of contacts in that area.
as to research, I have found that in most hobbies there is price range that goes from "cheap throwaway rubbish" to "King's new clothes" there is usually somewhere in the middle where there is a good quality item at a sensible price that is easy to sell on if one wishes to upgrade. Cheers