Guys - Help/advice appreciated on this one.

I have a brand new house, which has been wired with the new regulation
colour wiring. I want to connect 3 outside lights, which have already
had the wiring put in place for them. However I am confused as to which
wires correspond to live and neutral. The wires coming out of the wall
are grey, black and brown, with an unsheathed earth. So question is,
where on the lamp do I connect the grey, black and brown??? The brown
seems to be a switchable live, so do I connect both the grey and black
to the neutral????

I'm stumped, so any help appreciated.

Rich