Preheat the oven to 190 degrees C

Put the pasta in a large saucepan of boiling water and cook according to pack instructions

Meanwhile heat olive oil in a saucepan

Add the leek and fry until turning soft

Add the peas and cook for a couple of minutes

Add the garlic

Add th cornflour and stir

Pour in the milk while stirring

Keep stirring until the white sauce thickens

Season with a pinch of salt and freshly ground black pepper

Add the oregano

Drain the pasta when cooked

Stir the kidney beans into the pasta

Stir in the leek and pea sauce

Add the parmesan and half the cheddar

Place in a casserole or large baking dish

Sprinkle the remaining cheese on top

Bake for about 30 minutes until bubbling and brown on top