Yes I'm assuming each light has its own transformer and the wiring is thus
at mains volts. Not sure about the odd colours though.
What one needs is a tungsten lamp on a bit of wire. Beats a meter for this
stuff any day! grin.
Brian

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On Saturday, 9 November 2019 16:46:37 UTC, Lee Nowell wrote:
So for this I conclude that
Grey is neutral
black is perm live
Brown is switched live

Is this correct ?

Probably. But it's certainly not 12 volts :-)

More worryingly any idea why I am getting spurious voltages when the
switch
is off?

Induced voltage from parallel conductors.

With cables having coupling in the order of about 100pf/metre (minimum), it
only takes 10m to get a whole 1nF (i.e. 73uA leakage). Digital multimeters
(good ones, that is) are about 20Mohm input. If you measure with a good ol'
analogue meter you'll probably find a lot lower than [76V].

https://www2.theiet.org/forums/forum...&threadid=3053

See also

https://diy.stackexchange.com/questi...-be-at-0-volts

Owain