Heat the oil in a large, heavy based pan over a medium heat.
Add the mince and cook until brown
Add the onion and garlic and cook until softened, stirring all the time.
Cook the spaghetti according to the pack instructions.
Add red and green pepper, grated carrot, celery and mushrooms and stir well. Cook for another 2-3 minutes.
Open the passata or tinned tomatoes and add to the saucepan with the tomato puree and oregano . Bring to a simmer, then reduce the heat and cook for 10-15minutes
Drain the spaghetti and serve with the bolognese and a little grated cheese.