Thanks Ted,
I feared they may be out of production. That's a shame, they were good affordable tools, I'd never had a problem with mine and found it to be reasonably accurate, never needed to determine depth of pits etc but it saved me buying a couple of lemons in the past.
I didn't know Hosford made them to be honest, I have their dent raising set and wall thickness gauge and found both to be easy to use.
I'll have a look on their site, I think I'm going to have to bite the bullet and get one from somewhere.
I'll keep trawling the Internet aswell, if anything turns up I'll let you know.