I saw a knife the other day with twin blades, specially designed for cutting stencil chanels, it is going on my I must have that list. So it would probably be available over there.
I don,t know what Mylar is but I use milk bottle or ice cream container plastic to make quilting templates out of. If I get really desperate or can't find a plastic container big enough I will use light cardboard :) Needs must :lol: