Ok, First one, I know the seller but I'm impartial. The body is in very nice condition, lots of blue remaining, 1941 dated so early, nice adjustable bipod but can't tell if its Inglis or Enfield. The cocking handle is wrong, but don't worry as the one fitted is the early Enfield type (I could do a swap for a JI example and give you a fiver on top as one of mine needs one). The mag catch is a Mk2, the lower is non original to that gun and could be Enfield made, the barrel nut has had all the markings ground off but the Mk1 butt looks decent (Has some BSA parts fitted). The asking price pretty much reflects what's there but you can always try negotiating on that!
The Mk2 is a bit of a problem, I'll start with the lower being from a Mk1 not a Mk2 and the bipod is of a British Daimler type not the Inglis type. Next, the missing parts, the mag catch looks to be missing, the change lever definitely is missing and forsight protector is missing/broken. Those mssing parts will set you back about £30 by ebay prices, I'd also ask why the carry handle is bent back in that position, it suggests to me that something has broken as it should lock higher up than that.
I don't want to put a downer on things I just thought I'd throw all the comments at you and let you decide. Bare in mind that these guns are 70 years old and the mixing of parts is common place, a matching original could set you back lots but they are out there.