Originally Posted by HotLine1
Mike:

You happen to have a picture of that light fitting???

Sure do,
This is from a catalouge by HPM from 1994:

[Linked Image from electrical-photos.com]

There is also an earth terminal over the back (not shown) that all light fittings are required to have here regardless of wether they are metallic or not.
I mean to say, it must have an earth conductor supplying it.