Bog,
With time on the C130 or the C17 you will be bait for anyone in Canada. Hurry up the whole process and you may sneak into Air Canada. The Canadian military guys do well and I am sure RAF guys will be looked at in the same high regard. I have flown with a few boys from the RAF and they were !!!! hot.
Do yourself a favour though. Get your JAA ATPL before you go as you may need it if the right job does not come up. Far less options than England. There are a few guys on the 747/777 at BA living in Toronto. Am sure you could pull it off working for Virgin as well. Food for thought.
Good luck.
P.S. Converting from a JAA to Canadian ATPL is a joke. You could do it less than a week if you are prepared.