Bman, apparently the Canada cases were linked to UK travel after all. From an article on the G&M website today:
Two communities in Ontario and one in British Columbia now have confirmed cases of a COVID-19 variant that has spread rapidly in Britain and forced the government there to impose more severe lockdowns.
However, Ontario officials said Sunday the cases are connected to travel, rather than community spread — correcting information first provided on Saturday. A couple that was diagnosed with the new variant provided more information to contact tracers, and said they had met with a recent traveller to the United Kingdom.