If Amazon Canada is currently shipping to the UK then it's possible it might be cheaper to order the glossy version.
The price at Amazon is only $24.97 Canadian as opposed to £24.99 which is a big difference. It doesn't include the Blu-ray disc but it does include the poster. I don't know how much Amazon charges for shipping to the UK or what import charges might be but I thought I would mention it anyway.
Amazon product