For those that maybe interested there is some HQ etc date coding related information and pictures here
http://www.concourseparts.com.au/for...php?topic=30.0
and I also have a general model collection of date coding pictures here.
http://s872.photobucket.com/albums/a...cpZZ1QQtppZZ20

I hope this is of use to a few of you.
Cheers Paul.