On Sun, 26 Aug 2012 13:18:23 +0100, Andy Wade
wrote:

For UK wiring in twin- and triple-&-earth cable the alternative method
(as it used to be called) *is* standard. A 'switch-drop' T&E cable from
a ceiling rose or luminaire goes to one 2-way switch.

It's probably worth noting that the 'switch drop' doesn't have to go to
one of the 2-way switches, it can equally well go to any of the
intermediate legs (i.e. between two intermediate switches). This gives a
lot of flexibility and can reduce wiring lengths.

If as you say this method is now standard perhaps it's how the OP's setup
is wired, in which case the most he might have to change to fit his neon
is to ensure that the 'switch drop' connects to the leg which runs from
the house to the garage.

Richard.
http://www.rtrussell.co.uk/