In a large pan boil the pasta until al dente then drain the pasta and set aside
In a pan heat the vegetable oil on medium heat then add the finely diced onions and cook for 3-4 minutes until softened
Add the chopped garlic cloves and cook for 2-3 minutes
Add the chopped bell pepper and cook for 4-5 minutes
Add the canned tomatoes and bring to a gentle simmer
Cover and cook on medium heat for 15 minutes
Add the salt, black pepper, dried oregano and dried basil then cook the herbs for 4-6 minutes
Add the double cream and tomato purée then cook for 5 minutes
Add the drained tuna and cook for a further 3-4 minutes
Add the al dente pasta and mix in before cooking for a further 5 minutes
Transfer the whole mixture into an ovenproof dish then top with the grated cheddar cheese
Bake in the centre of a preheated oven at 190°C/375°F/gas mark 5 for 15-20 minutes
Your tomato tuna pasta bake is ready!