How much will it cost me to return an Amazon item with Royal Mail?

Basically, I bought a BlackBerry case for a friend of mine for Christmas but he bought an iPhone so I no longer need it. I have printed everything off and it is in the original packaging. I'm just wondering how much it will cost to return it. Also, can I put a stamp on it so I can just post it via a post box?

About £1.50

It depends on the weight and how you send it so best to go to post office to check. Also with first or second class the post office will give you proof of posting so should it go missing you can prove you sent it. It will probably cost about £1.

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