Hi Ade, We are interested in this too. I know the Llyn quite well but don't know any sites at Pwllheli. I believe the Trim's are already booked in somewhere and detail is in a thread somewhere on this site...
Sam may be doing 3 peaks the w/e of the Thornbury open but I will go anyway (either cadge a ride or beg someone to crew for me) and we are planning to be at the Weston Open as part of our summer hoilday in Swanage...no, really it's nicer than it sounds.