Preheat oven to 160 degrees fan-forced (180 regular conventional )
To make the bechamel sauce melt butter in a medium saucepan over medium-high heat until foaming
Add flour
Slowly add milk, whisking constantly, until the mixture is smooth
Return to heat. Cook, stirring with a wooden spoon, for 10 to 12 minutes or until sauce comes to a boil, thickens and coats the back of a wooden spoon
Remove from heat. Stir in half the cheese and salt
In a large, deep baking dish, layer v2 Bolognese sauce (see below) and pasta sheets at least 3 times leaving pasta on top
Sprinkle the remaining cheese over the pasta and pour over the bechamel. Bake for 40 minutes or until bubbling brown and golden on top