In article ,
Pete wrote:
Is it possible to power an LED from a light switch (live only
connections, and possible earth) so an illuminated LED can indicate if
the light is on or off?

Do you want the indicator to be on when the lamp is on, or would on when
it's off be OK?

I think it's the former you want since you mention an earth. What the
regs say about using the earth as a return for the tiny amount of current
required, I'm not sure, as plenty of electronic equipment uses this method
for RFI suppression.

--
*Some people are only alive because it is illegal to kill.

Dave Plowman London SW 12
RIP Acorn