well zeberdee your in luck mate:)
Two members on this board are from the bristol area, myself and birdman so a little help avaliable. Two places you could take a trial lesson, Filton airfield this would cost £125 an hour if i remember correctly, the advantages of filton are: Its quiet because its a private airfield, you may see some nice planes though concordes parked there, and week days theres usually some A340 or 747's in. The biggest problem is it is more expensive than...
Bristol airport, here you will pay if they still charge the same from my lessons, £115 an hour for a trial lesson, £110 for normal lessons, Bristol flying club are really good, they use a piper warrior, the advantages of bristol, its cheaper, its a commercial airfield so you get a  feel for what its like to operate in those conditions,  If you do choose Bristol ask for a mr Waite for your instructor, this guy is really good

no probs. Its worth checking to make sure of the costs, its been a while, but i cant imagine them changing all that much. What part of bristol/bath will you be visiting, if you dont mind me asking.

its a great museum, i believe its about 40 mins from where your gonna be, maybe a little less. with my dad working at the base i have ended up going a few times and you always see something new. Concorde and the aircraft carrier are definatly the best bits. If you go on a week day your likely to see the apache flying around, and also quite a few lynx and gazelles possibly a few harriers to, they have a really good viewing deck in the museum.