Robbie , first up where in shire do you hail from. Im in culter
I have the 151 its been a good welder earnt its keep doing my landy and jobbing for family and friends, do you have a house where you can put a dedicated 15amp unit in to run it, the 151 on full chap will chew 13 amp fuses
You can bodge it but not recomended.
When i need to weld full tilt i use the cooker outlet in the kitchen and a heavy duty generator extension lead.
Full powers only really needed for 4mm + plate which is overkill for landy , i used 4mm on my dads trailer. Never touched my landy on full power
A 135 would probably do the job fine.