PeterC wrote:
I've a light fitting to wire in that has just L and N - no Earth.
The 1-way, 1-gang switch is in a convenient position (! - had to
happen eventually) but there's no neutral.
I'll replace the switch with a 2-way 2-gang plate and wire the new
light into that.


Would it be OK to replace the switch cable from the existing ceiling
rose with flat 3 & E and use one of the wires as N, suitably marked
of course?

Yes.

--
Adam