Thank you both for the feedback, it's good to know that it is legit.
Price wasn't too important on this occasion as it was bought for me as a gift, but definitely good to get an understanding for future purchases.
Clearly getting one via auction is the better value for money, I guess because I am just starting out I am a little weary that I buying a legit one as my only auction options when buying in the UK seem to be eBay, and I imagine, like you say, there has been some horror stories from on there.
For instance, I have seen a poster I want on At The Movies, which is a London store based Poster seller, however the poster is £600 when apparently it goes for around £200.
I am no rush so I obviously won't be paying £600, not that I would even if I was in a rush, but given my auction options in the UK are limited it will either be a case of purchasing the poster I want if someone on here has it, or having to buy from a dealer.
Hoping I'm able to get it at some point.