Hmm....

Seems to be an ashtray block off for when Power Windows were fitted to a GTS 4 door.
Did it carry over to the console later? My memory is that the console didn't have an ashtray in the HQ Sandman. But when I mentioned this before I was told I was wrong. That could have been because it was "assumed" no hole in the console? Anyway it has to be a fairly rare item (either way).