The majority of my clients are in Ontario, I send all Quebec clients to a colleague there, and I do a lot in BC. Thats partially because for months a company out there put my toll free number on their emails. I would inform them I was a different company, and when they started asking questions they realized I was about half the price. (Its not anyone who posts on this board)
So i ended up with quite a few BC clients. For all of my clients i advise 2 letters of reference. For anyone in Saskatchewan (I have none) or Alberta (I have a couple) I will advise 3 to be on the safe side. Obviously Michelle would know better than I about those 2 provinces.