Euroman,
I have a UK account with TD Waterhouse that allows me to purchase stocks on the Canadian exchanges (and a number of others) and hold C$ balances. I find it very convenient.
Perhaps you could call them and see if they would allow you to transfer your shares in as Canadian Dollar denominated holdings? A share is a share as far as I can see.
I don't know why Tyhee bothers with a dual listing. Canada is the premier market for gold juniors. Lack of a UK listing hasn't stopped me buying the stock. Waste of money in my view.
Regards
Chris