No, I presume that he means actually incorporate the new socket into the ring. Again IF the FCU is definitely part of the ring, and provided that it is just one socket you wish to add, you could actually spur off (the supply side of) the FCU to supply that one socket, without the need for any FCU/fuse in between - but that's not as 'nice' actually incorporating the new socket into the ring - what is known as an 'unfused spur' (which is only allowed to supply one socket).
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