These two articles reveal that the clock disappeared for decades but that it still exists in the hands of a private custodian (not named) and is sometimes exhibited. If you can contact this custodian (maybe via the Review?) he may very well have further information about it.

http://www.theforestreview.co.uk/article.cfm?id=104920&headline=Cinderford%20memori...

http://www.theforestreview.co.uk/article.cfm?id=107351&headline=Remembering%20Cinde...