Hi Chris.... me and my other half are currently in the process of sorting out emmigrating to British Columbia.
You might want to check out the british expats forum:
Living & Moving Abroad : British Expat Discussion Forum
There are alot of people on there that have moved / are in the process / did it years ago... and are thinking about it.
As far as i see it Quebec is the most French speaking part of Canada... but even then i believe most can speak english as well.
If you want to ask questions about are experience so far etc... just p.m. me!!
Dave.