Okay so I'm not going to link to this following the rules but surely, even in good but still slightly discolored condition, a loose one of these cannot be worth £121 can it?
It is complete but to my thinking figure only is 30-50 depending on condition plus say 10-15 for the blaster and maybe an extra £20-25 for the helmet so call it £90 tops for great condition?
If the blaster is correct as said, it's cheap IMO and very little is starting to surprise me on prices recently. They're hard to find and the helmet - if legit - is always sought after. Someone might have a mint loose figure and want the other bits.