I offered to be ProfChrisReed's guinea pig and I'm glad I did.
The taster day was well organised and I got a full 6 launches in with the CFI as my instructor. It was a very good introduction indeed to a 'day in the life of a glider pilot' and I now have no fear of the 'hanging around all day to get 5 minutes in the air ' thing, at least at this club. As Chris says, 6 launches in a day is quite tiring, and it's plenty to keep you occupied.
I thoroughly enjoyed the gliding experience and getting to know the club members (but don't mention playing the Ukulele). I signed up for the Fixed Price to Solo scheme as I decided it is something I want to do and I don't see that it conflicts with my 'other life' as a power pilot at all.
This is a good deal. Happy to help interested PPLs decide - feel free to PM.