Remove the Beef from the fridge 2 hours before cooking. Pre-heat the oven to gas mark 7, 220°C. Gently rub the Rib of Beef with salt and pepper to season, place in a roasting tray. Cook for 30 mins; reduce to gas mark 4, 180°C and cook for a further 15 mins per 450g - for rare beef; 15 mins medium rare and 30 mins for well done. Remove from the oven and transfer to a plate or board and allow it to stand in a warm place for 30 mins, loosely covered with foil before carving.