Bernard!
Thank you very much. I enjoyed reading the thread you directed me to also.
It's not my sort of thing, as I feel I might be losing the will with early items, so I will be putting it on ebay in due course. I won't hold my breath though - I had one the same in amber a few weeks ago (fortunately I had guessed and listed it as Sowerby in my previous ignorance... before joining this site and finding out it could be any one of 100's of factories) and it made all of £1!

Thanks again,
Stu.