Classic minestrone soup

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• 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)
• 70 g diced smoked pancetta
• 1 large garlic clove(crushed)
• 0.5 tsp dried oregano
• 400 g cannellini beans(1 can)
• 400 g chopped tomatoes(1 can)
• 2 tbsp tomato purée
• 1.2 litre vegetable stock
• 1 bay leaf
• 70 g small pasta
• 100 g greens(kale, chard or cavolo nero work well)
• 1 basil(handful)
• 1 parmesan(finely grated, to serve)