Hi Pauline,
Your spoon was assayed at London in 1797. The date is confirmed by the two cusps (see:
http://www.925-1000.com/silverglossary2.html) in the Duty Mark, denoting the increase in Duty in that year.
The maker was either George Burrows(I) or George Brasier, I would go with Burrows as he was a known spoonmaker and judging by the amount of surviving flatware made by himself and the continuation of his business by his widow and his son (Alice and George (II)), he was a prolific maker with large workshops.
See:
http://www.925-1000.com/bx_a&gBurrowsL.html for examples of the work from the continuation of the business.
Regards Trev.