A couple of misleading bits on costings,
Rusty Sparrow quotes his D9 at £10/hr, the add he links to says 10 litres an hour so already over £10/hr on fuel alone, I am not sure how they manage to operate at £5/hr dry either, this may cover day to day maintenance but I suspect the engine fund is a bit dry so watch out for big cash calls.
On the other side, Dan D quotes
Airfield/flying club membership up to £500.
, whilst I am sure there are clubs around that charge this I would say the MOST you would need is an associate membership and most airfields you don't have to be in a club so you probably will not have to fork out for this anyway.