In article .com,
says...
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 the drop, or rise, of the cables still falls within the boundaries of
the socket plate, you're fine. If not, then the cables should either be
buried deeper than 50mm into the wall, or given suitabel prtection along
their whole length (like heavy gauge steel conduit, rather than the thin
steel capping). This is to stop a screw or nail being inserted into the
cable at some later date, because nobody had any idea where it was.

If you have to join new lengths of cable on, and the joint will be
inaccessible afterwards, the only options permitted are soldering (can be
difficult to make a suitable joint, or crimping (using decent crimps, and
a ratchet type crimper, rather than the cheapo squeeze together ones sold
in car accessory shops). The crimps should then be suitably insulated,
ideally by using heat shrink sleeving over each crimp individually, then
a second layer covering the whole shebang, making sure that it covers
both cable sheaths. Remember to put the HS sleeving on before crimping
the joints!