Here is the Canada-UK Bilateral Agreement from Transport Canada. It does not appear to have been updated since the takeover of Canadian.
http://www.cta-otc.gc.ca/air-aerien/.../unitedk_e.pdf
I do know that BMI had received rights from the UK Civil Aviation authorities rights to serve cities such as Calgary, Ottawa, St. Johns etc. I will try to find the link and add it here after.
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Rewards Canada Frequent Flier Resource
Rewards Canada