Where can I BUY an iPhone (not contract) in UK?

I know I can get the iPhone 5S on contract and from the apple store, but if I get the unlocked iPhone 5S online from apple (as no apple store nearby) will it work with the sim card I got from orange? (the size is suitable for the 5S) Or is their any stores I can buy the phone?

Thanks.

Added (1). (As I've said, I've been on the apple website, I just want to know where else I can get one from? Or IF I order of the apple website, will I be able to be on Orange with the nano sim for the iPhone 5S)

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