Thanks Guys.
Robin, found a pic of Ferret CES, certainly looks very similar.
Lynn, yes- LV6/MT11
Hardly appears to be an exotic piece of kit, and the design does appear to be long lived. It was originally bought for a WOT restoration as the design was right, but the date was out by 20+ years.
I have found they are still available :
http://www.thexmod.com/item_detail.asp?id=8730 , hence my refferal to a Land Rover connection.
This one will go into the back of the Humber, dare say it will be in use shortly
Rich.