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What are the regulations regarding moving an electric wall socket about
6 inches horizontally from where it is now? I read somewhere this is
taboo. What is involved...soldered joints etc?

If it is a matter of moving it to make it accessable the easy
alternative is to leave it where it is and spur off another socket
alongside. If alongside happens to be on the line of the ring cabling
(unlikely) it is easy enough to add an extra socket to the ring. Adding
extra sockets means you escape the problems of extending/replacing
existing cable runs.

--
Roger