Thanks Baz, I have contacted a few suppliers already, not had much response yet though, I think its still the original torch.
I had to open it up to fix an air leak before I could even test it and did wonder about the possibiliy of caps holding a charge so was careful
Those links you sent look much more comprehensive than any I've found so far so I'l contact them next week and see if they're able to help.
I've taken some pictures of the torch here:
http://s1157.photobucket.com/albums/...rlidge/plasma/
Cheers
Bruce