I'll send some photos over to Grays and see what dates they give me...
Apologies for wandering away from the topic, just thought I should share my experience with GN. After seeing the below post on the Forum I wrote to GN asking whether they could provide photos of the GN Volcano and this is how they responded:
http://custombats.co.uk/cbforum/index.php?topic=14156.0"Good afternoon,
Thank you for your email, unfortunately we no longer have an image of this product as it is over 8 years old.
I do apologise for any inconvenience caused.
Kind regards
Grays International"
It really surprised me since they were the makers; never imagined they would not be having any records on this model.