Gents, thank you so much for the prompt and very helpful nformation. I came across a kit manufactured by Malcolm Wilde, he is an authority on all things horological. Malcolm nformed he has a kit for sale. By no means a cheap acquisition, £185 + carriage, but I should think a good investment. I will post a pic when the item arrives, and I manage to get it fitted.
Martin, to your ssuggestionI very much like the notion of fitting a stepper motor but I am just not there yet with competency of such technology.
Kind regards, Brian