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I bought a fitbit one from the UK amazon store. It works great, though I am a little concerned by the idea upthread that it can be lost so easily!

Same here, I don't trust the clip it's flimsy. I opted for getting this to use while exercising instead: http://www.amazon.co.uk/gp/product/B008M6PA4A/

For day to day I just leave it in my pocket. Haven't lost it in the last few months.