You will need a Canadian license to work in Canada.For an ATPL you will have to do
three exams. One instruments and two for your ATPL.Exams in Canada you will have
to do some studying, are harder than the U.S.but not that difficult.
Work permits: apply in the U.K. ! They are much harder to get once you are in Canada. If you were a refugee from Kosovo,no problem.Brits it's more difficult.
Shack up with a Canadian lass.
Pay is not great in Canada unless your at Air Canada
Cheers