Low end on that machine is 50 Amos which you’ll struggle to do bodywork with. £300 ex vat will get you a very suitable brand new machine with warranty. GYS Easymig / smartmig range is what id be looking at.
It's a SIP!........
I've got a GYS 140 Easymig cost about £400 and its very good, I got rid of a SIP as I'd had enough of it!
I did a short review on here if you seach for it.