Hi,
This is a Clarke 165e. I have one and it was in daily use till about 4 months ago when I bought a new Fronius welder. Mine was bought in 1987 from Machine Mart in Darlington. I used it for welding Aluminium and Stainless as well as mild steel. It is only supposed to use up to .8 wire but I have used it with 1mm with no problems
I fitted a fan (to suck air out of the case) and a euro-torch (much better than the standard Clarkes torch).
You will get the parts from Clarkes, and they are cheap compared with other models.
Good luck with it.
Tony
P.S. I could do with a wiring diagram for this model if anyone has a copy? It's one thing that Clarkes do not have.