On the comparative life expectancy of Black Brits and Canadians

This is from Dan Gardner's Don't Trust The Trust Decline, talking about how others may make incorrect assumptions about the world by making assumptions from watching American-focused media:

I’m very confident that most people assume that black Britons also have shorter life expectancies than white Britons. They don’t. In fact, the average black Briton from the Caribbean lives a little longer than the average white Briton, and the average black Briton from Africa has a much longer life expectancy — longer even than the life expectancy in Japan, which is among the world’s highest. (Similarly, all-cause mortality is lower among black Canadians than white Canadians. I doubt I’ll ever read that in the Toronto Star, although I will read headlines like this.)