Why was Ab Aeterno not shown on Sky 1 in the UK 30 April?

I've been on the Sky 1 website and can't find any mention of this. Has anyone else heard or seen any explanation? If it is important to show it in the US because of some relevance to next weeks episode (I think I read that here a while ago, hope that isn't a spoiler), why are we not being shown it in the UK? I will watch it again anyway before next week (SKY+ is brilliant!) just in case!

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