The frame is a MERIDA Road Racing 905 and it's got "magnesium" written all over it and warnings about touching up any scratches etc. Merida are pretty famous for their magnesium frames and cracking isn't unheard of. I guess it is some kind of magnesium/aluminum alloy or something.
I had Ian Lovell from Servalloy in Ingleburn weld up some magneium alloy Marzocchi forks a few years ago, but Servalloy seems to have disappeared. Any other ideas ?
Thanks again,
Martin