Chicken chasseur

Name: Chicken chasseur
Prep time: 30 min
Cook time: 2 h
Total time: 2 h 30 min
Cuisine: French
Ingredients: 1 x 1.5kg/3lb 5oz chicken, cut into 8 pieces; salt and freshly ground black pepper; 50g/2oz plain flour; 2 tbsp olive oil; 115g/4oz butter; 110g/4oz smoked streaky bacon, sliced into lardons; 150g/5½oz button mushrooms; 150g/5½oz shallots or onions, thickly sliced; 55g/2oz caster sugar; 175ml/6fl oz white wine; 300ml/10fl oz chicken stock; 2 tbsp tomato purée; 2 tbsp tarragon, finely chopped; 2 tomatoes, skinned, seeded and chopped; 4 tbsp flat leaf parsley, finely chopped; 1 kg/2lb 4oz floury potatoes, peeled and cut into chunks; 115g/4oz butter; 125ml/4fl oz full fat milk