Skyservice have 5 A320s working for Mytravel (airtours) this summer.
Their own (Canadian) busy season is winter, so have spare capacity that can cover the Mytravel peak summer requirement.
Seems like a good arrangement, unless you happen to be an EU pilot.
No prizes for guessing how many EU pilots are likeley to be going to Canada next winter.
I would have no problem if there was a reciprical agreement, but the Canadian authorities won't allow that, and in any case the Canadians are cheap.
The UK dept of Transport and CAA both apparently have no objections.
Do you?
If so write to your MP