and all brits, in somne way or another, were Imperialists at the time.
lol
There was a famous survey done not many years after the end of the war (I forget the date) in which it was found that a majority of the population could not name a single colony. The reality is that Empire was not part of the reality of Working Class life in Britain (outside some of the ports and a couple of big inland cities with lots of (Irish and-or Jewish) immigrants... and in both it was more a rallying cry for xenophobia than a reality, as such...), except in a crude economic sense (and even then not everywhere; the well-known extreme dependence of East Lancashire on imperial markets* was unusual).
Now you could make the argument that everyone (or almost everyone) of Churchill's age-and-class was an imperialist at that time, and you'd be right.
*As in that dreadful pun of J.B.Priestley's... "Blackburn expects every man to do his dhootie".