Thanks for the response guys, particularly Mick Pearce. That is very helpful.
Harry Rivers, there are only two versions of the sheet music that I could find, one of which is at:
The French Ambassador sheet music in the key of Bb

The other:
The French Ambassador sheet music in the key of G

Both versions have a midi but it is played at a much slower tempo than the tune as played by Dave Swarbrick as described by Mick.