Hiya Nathan 

A little off-topic here, but 
definitely relevant 

Dissapointed for £20.00 though - it has the Promande of Titanic and has a sticker on the box saying £7.50  
UK law stipulates that if an item comes attached with a price sticker like that, it must be removed if a higher price is to be charged.  Leaving it intact, means that you 
only have to pay 
that price.  In this case, £7.50.  That is the law, and any retailer not following that, can be prosecuted 

You are entitled to a FULL refund, or reduction, or you can even contact Trading Standards about it 

http://www.tradingstandards.gov.uk/
Carl.