It's really not difficult - a flying club has to be run properly and accountable to CAA requirements, which for transition to an EASA ATO rather than a RF will require Ops Manual, SMS etc.. anyway. The DDH has to be assured and ensure that the flying club operating within his/her area of responsibility is properly run, governed and intregrating with the operation in a safe manner. A number of RAF clubs have already successfully been through this on both counts and things are running fine - recent audits have highlighted no concerns at all. PM me if you want to discuss in more detail.