Interestingly, as a British person, I've never heard of Lester B Pearson before your comment. Possibly for the same reason it took me so long to find out even a single negative thing about the British Empire: the UK not wanting to talk about anything embarrassing in its history.

For anyone else interested in learning more: https://en.wikipedia.org/wiki/Lester_B._Pearson#Role_in_Suez...