Also got the welder working with some trial and error and picked up some sheet. The penny really dropped. I was sat looking at the spool of wire and realised it was either stainless or no gas. The tip was also slightly damaged on closer inspection so it kept birdnesting. Went to screfix and ordered a roll if mild steel and a pack of tips to suit. Glad to know it' the monkey working it and not the welder that's broken lol