Here is something straight from the company that makes Quorn:
"The Canadian authorities specify minimum nutritional values for key nutrients for any 'simulated poultry substitutes' to be sold in Canada. As they currently stand, most of our products would not meet all of these criteria, and to achieve this, in some cases, it would be necessary to fortify Quorn products with some of these nutrients. Fortification does not at present meet with our brand values.
We are therefore unable to advise when or if we will be able to sell Quorn products in Canada." ~ Quora