temperature and oven mode to roast a chicken
1 Check oven has reached temperature, 2  Roast chicken for 80 minutes at 190 Â°C (375 Â°F-Gas 5). 3  Increase the oven heat to 220 Â°C (425 Â°F-Gas 7), for the final 15 minutes to turn the skin crisp and golden.4  Total cooking time 95 minutes. Let bird breath for 10 minutes. 2  Place into suitable roasting tin. 3  Check oven has reached temperature, 4  Roast bird for 25 minutes at 220 Â°C (425 Â°F-Gas 7). 5  Reduce the oven temperature to 180 Â°C (350 Â°F-Gas 4). 6  Roast bird for 20 minutes per 450g. 7  Remove the joint from the oven and check that juices run clear.