Put pasta on to boil and whilst its boiling make your cheese sauce
Just put milk in pan and start boiling it add about a table spoon of cornflour stir until slightly thickens Add grated cheese, stirring all the time, wait til thickens but not too much
Take off heat add your drained tuna and sweetcorn to sause and stir
When pasta is done add your sauce to it and stir, Put it in oven dish and spinkle with cheese or crisp and cheese
Bang in oven for about 15 mins on gas 5

In stead of using chees sauce I use condensed chicken or mushroom soup! It's a quick alternative.