Join Date: Mar 2017
Many thanks for all the helpful comments.
The threaded tang and pommel nut had led to me dismissing the Napoleonic era possibility, but my experience thus far has been rather limited, I haven't handled enough variations of these things.
If I collate the comments from Jim McD., Kronckew and Will M, this sabre could be British or Scottish, could date between 1800-1840, and looks like a possible private purchase/ band officer's sabre.
With regards the band officer idea, I had looked at French Tambour-major (drum major) swords that reminded of this piece (see pic. Courtesy of Primardeco Auctions, Toulouse, Fr.)