Preheat oven to 180°C.
Cook pasta in a large saucepan of boiling water following packet directions, then drain.
Melt the margarine in a large saucepan over medium-low heat.
Add the flour and cook, stirring, for 1 minute.
Remove from heat when it starts to foam.
Gradually add the milk and place over medium heat, stirring constantly until the mixture thickens (approx. 5 mins).
Reduce heat to low and cook for 2 minutes.
Add the white sauce, tuna and mixed vegetables to the pasta and stir until well combined.
Spoon into a 2L (8-cup) capacity ovenproof dish. (Note: If you selected a larger yield, you will need a bigger dish, or an additional dish)
Combine the breadcrumbs and cheddar in a bowl and sprinkle over the pasta mixture.
Bake in oven for 15 minutes or until golden.
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