One place we've found a fantastic source of information is the British Expats Canada forum:
http://britishexpats.com/forum/forumdisplay.php?f=56
If you are considering a move to Canada, you will find lots of people there in the same or similar situation. There are plenty of people there who can offer advice and point out relevant information.
Before you post read the sticky threads on the front page, and also take a look at the wiki as that will give you a good deal of information and answer the most common questions.
