Cheese sauce/gravy

1) Melt the butter in a saucepan over a medium heat.
2) Stir in the flour and cook for 1-2 minutes.
3) Gradually stir in the milks, whisking all the time to ensure a smooth sauce.
4) Simmer gently for 8-10 minutes and season to taste
5) Stir in cheese and allow to melt.
6) Use in any recipe that requires cheese sauce.