Hi Alison. It sounds as though you are wanting to use a torch
that is fed with acetylene only, and self-feeds air. The only
time I’ve seen these is in illustrations in American books. As
you have discovered we do have such torches for propane, but not
acetylene, as far as I know.
I believe that until a few years ago you couldn’t get acetylene
here unless you were actually in business. Simply not available
to the hobbyist, on safety grounds. Changed now, but it’s only
used as far as I know with oxygen.
Many jewellers here use the self-blowing propane torches. I use
propane and oxygen for most of my work, and a self-blowing
propane torch (which gives a bigger softer flame) for annealing
I’m fairly sure that an acetylene regulator will NOT fit an
acetylene bottle here. All such supplies are best got from a
welding supply house, most towns have one (Yellow pages).