Classic minestrone soup

Name: Classic minestrone soup
Ingredients: 3 tbsp olive oil, plus extra to serve; 1 onion, finely chopped; 1 celery stick, finely chopped; 1 carrot, peeled and finely chopped; 1 courgette, finely chopped; 70g diced smoked pancetta; 1 large garlic clove, crushed; ½ tsp dried oregano; 1 x 400g can cannellini beans; 1 x 400g can chopped tomatoes; 2 tbsp tomato purée; 1.2 litre vegetable stock; 1 bay leaf; 70g small pasta; 100g greens - kale, chard or cavolo nero work well; handful of basil; finely grated parmesan, to serve