Yep Duncan !
I don't know how you talk about that in UK as the name Red Ensign is not proper to talk about the country ... In French I have to say "portant le drapeau Britannique" (flying the British flag) without merchand marine or other ensign distinction
May be I have to say : flying the British Red Ensign (there is many other Red Ensign from Australia to Ghana ... )
Anyway, her registration port was London (in UK .. not in Ontario or in California
)
Xtian