For £90 i really wouldnt take the risk. A mig welder isnt just for christmas...Its for life
. And you know sods law will mean if u buy cheap ull buy twice.
Id recommend getting Clarke gas MIG welder, i managed to buy mine for £95 (used) and the rest of the bits for it meant that in total its cost me £200 including a pub sized gas bottle, co2 regulator, 5kg of wire, co2 refill, new tips, shrouds and gas valve.