Most clubs should be able to offer you something. A lot of the time its just a case of the club organising an instructor and a winch/tug driver. Probably best to contact whichever club you fancy and see if they can organise something for you. Perhaps consider Scotland, some excellent clubs up this way - Highland Gliding Club, Deeside Club, Cairngorm club. All have first class facilities and will have no problems finding staff for you. And of course, beautiful scenery and plenty soaring in wave at 20'000 feet!