Cook pasta in boiling water until tender, or follow pasta instructions.
Measure olive oil into large saucepan, place on medium heat, when hot add onion & cook for around 5mins, stirring all the time. When onion starts to brown add crushed garlic & cook for a further 2mins.
Add peppers, tomatoes & mixed herbs. Bring to the boil, then reduce heat & simmer without a lid for about 10mins.
Drain the pasta & add the sauce, add the sweet corn & mix well.
Just before serving, gently stir in the tune, but don't over stir otherwise the chunks will break up too much.