Hi Martin.
The bike you have looks like a Comerfords Cub but it’s not quite right and I’ll check but I think, all of them came from one batch of Mountain Cubs sold to Comerfords in 66.
I know this for two reasons, 1 Gordon Farley told me, they were works replica of the bikes built and used by Gordon and Roy Peplow in 64,65 and 66, in 1962 they were still riding 350’s and 2, I have all the paperwork for mine...
Your signature shows you live near Huntingdon, so do I if you want to look at mine..
Jon