Garlic Braised Chicken with Lemon and Rosemary Potatoes and Olives

• 4 tablespoons olive oil
• 25 g (1 oz) unsalted butter

Preheat the oven to 200°C/400°F/gas mark 6. Heat the olive oil and butter in a large ovenproof frying pan or a heavy-duty roasting tin. Add the chicken pieces in a single layer, then add the whole garlic cloves and the bay leaf and cook for 8-10 minutes, until coloured all over. Cover