Sausage & parmesan cobbler

Name: Sausage & parmesan cobbler
Prep time: 20 min
Cook time: 50 min
Total time: 1 h 10 min
Cuisine: European
Ingredients: 1 tsp olive oil; 12 herby sausages (we used Lincolnshire); 4 rashers streaky dry-cured smoked bacon , chopped; 1 large onion , chopped; 1 medium carrot , chopped; 1 garlic clove , crushed; 10 sage leaves, chopped, plus a few whole to decorate; leaves from 2 thyme sprig (optional); 1 tsp hot smoked paprika , plus an extra sprinkle for the top; 2 tbsp tomato purée; 2 x 400g cans chopped tomatoes; 2 tbsp dark brown muscovado sugar; 400g can cannellini beans , drained and rinsed; 1 tbsp Worcestershire sauce; 250g self-raising flour , plus extra for dusting; 50g cold butter , cut into cubes; 125ml milk; 1 egg , beaten; 50g parmesan , finely grated