If the circuit you are proposing to install the socket onto is already protected by an RCD and not just an MCB then there is no problem. However if not then the outdoor socket must be of the RCD protected type.
just use a rcd fcu (last i heared B&Q do them cheap) in the ring then from thier straight through the wall into the back of the socket (and make sure you seal that entry to the outdorr socket)
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