Hello The Ferret,
Thank you for all your information. Now that I have been looking at it the adaptor plate between the engine and gear box is really obvious.
I have taken some more photographs of the gear box and of the numbers on the top of the gear box.
Has anyone heard of a mob called MF Conversions? There is what looks like a Victorian phone number - well maybe a phone number and then below it a product code MFC 021
Yes I did try a couple of different versions of the telephone number just in case - they were all disconnected or not really phone numbers.
Kind Regards
Lionel