The 7 Myths

[Jolly]

https://www.military-history.org/feature/the-most-common-battle-of-britain-myths.htm

[Renauda]

Among the “foreigners” in the BoB, Canadians served in both its own RCAF squadron and individually in the RAF:

https://www.canada.ca/en/news/archive/2015/09/battle-britain-fighting-freedom.html

By a long shot however it was the Poles who distinguished themselves in the BoB. RAF 303 “Kosciusko” Squadron, led by a Canadian, Flight Lt. John Kent, is credited with highest number of confirmed kills in the campaign;

https://en.m.wikipedia.org/wiki/No._303_Squadron_RAF

Highly recommended reading:

Lynne Olson & Stanley Cloud, A Question of Honour: The Kosciusko Squadron, Forgotten Heroes of WW II