Add an electric socket to an existing light circuit (230v AC)
It sounds as though you have phase, neutral and earth available to you. So the initial answer is yes but there are two snags:


UK regulations require an RCD/ELCB (earth leakage protection) device on all socket circuits.
Someone could plug in a high current device into the lighting circuit.


Best way out of it would be to tap off L, N &amp; E through a low current RCD and to a 13 A socket. That would address both problems. I had a look for low current (2 A) RCD but can't find any in RS or Farnell catalogues.