Instead of using 600ml milk, you can use 300ml single cream.
When I make the white sauce I don't measure it but it needs to be quite thick as when it cooks in the oven it seems to thin out. So you might need to adjust the flour to butter and milk to get correct thickness.
Tastiest chicken pie. Can't keep up with my husbands demands for it. - 26 Feb 2014
Great pie, very succulent. - 28 Jan 2016
This is the easiest and nicest pie I have ever made ) The sauce is so tasty and thick, but family loved it! - 03 Jan 2014