http://store.apple.com/uk/product/MB974ZM/B/apple-world-travel-adapter-kit
AFAIK this is the only way to get the official Apple plug attachments without buying an entirely new charger.
Wow you paid £35 to get all that stuff you don't need. This is what I bought when I got my Ipad back from the US.
http://www.amazon.co.uk/Standard-3-...5048&sr=8-1&keywords=ipad+adapter+plug+for+uk
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