Hello,

I wish to use some X10 transmitters within some [existing] light switches
(like these: http://www.homeautomation.eu.com/category/6), however they
require a neutral connection as well as live - and as everyone knows this
does not exist in a typical UK light switch.
Dropping a new neutral wire to existing switches would be impossible except
when each room is being decorated.

So, I'm looking at alternatives. One idea is to see about using earth as
neutral for this as it's just a reference point for the X10 signal. As
netural will be commoned to earth somewhere (incoming supply? substation?)
what reasons are there not to do this?
We're not talking about putting a load between live and earth, just using
earth as a reference point for a signal to be transmitted on the live line
from.
Can I common up netural and earth in the CU?? I've yet to see what voltage
is between them but last time I looked a few years back it was only a few
volts.

Any other suggestions to get this working?

Alan.