I knew about the Sir George Thomas link as he played Mortimer in the Brighton event of 1904, as well as on other occasions. In 1904 Mortimer played 10 games in the London League for the Metropolitan club in addition to at least 3 other tournaments.Frederick Rhine wrote:I'm told that Mortimer's opponents in his last tournaments included Sir George Thomas, E.G. Sergeant, and J.H. Blake….
Beware when researching G Thomas; I know of 6 G Thomases some of whose games have been aggregated with Sir G A’s on commercially available databases.
When E G Sergeant played in the British in 1959 he played against the less well known F Clough and D G Ellison who may turn out to be the English veteran player George Ellison and the Welsh veteran Fred Clough. Both these players played rated games earlier this year and would be M3s.