you can only have one double socket on a spur from a ring, UNLESS you fit a fused connection unit (fused spur) in place of the original socket then you can add as many as you like to the spur because the max. load you can put on the spur will be 13Amps, as thats the biggest fuse you can fit.
Check that the existing socket is on a ring, if old it may be a radial direct from con.unit on a 20Amp fuse/mcb in which case you can add as many sockets as you want in an area not more than 20 sq. metres, regards SPARX
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