I have a dual 13A socket under my kitchen sink - powering the dishwasher
and waste disposal device. I need power for an additional appliance and
would prefer to install an additional socket rather than use a 2-way
adapter.

The current socket has 3 x 2.5mm T&E cables connected to it - which I
assume to be two for the ring main plus a spur. The cables all disappear
behind the cabinets (I didn't install them!) and there's no easy way of
knowing which is the spur - other than separating the 3 and finding out
what doesn't then work, etc.

If there were only two, it would be easy to wire the new socket into the
ring by diverting one of the two to it and then having another short
cable between the two sockets.

If I randomly pick one of the three to divert, I may well achieve the
same thing. But I may instead end up with two daisy-chained spurs. [This
probably wouldn't matter in practice, even though it's not in accordance
with the regs].

However, if I could get FOUR wires into the existing socket, I would
have a ring plus two separate spurs - which would presumably be ok? I
wouldn't then need to worry about which one is the spur.

Is this likely to be possible? Any other relevant comments (ignoring
Part P, of course!)?
--
Cheers,
Roger
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