In spite of being housed within a private members’ club, the smartly decorated Frontline Restaurant is, happily, open to the public. Here you can tuck into classic British dishes, such as nettle and wild garlic soup, haddock and chips, and a Bakewell tart to finish. Prices are on the high side, but the service is charming and the interior, which is decorated with some of the most iconic photographs of the 20th century, is laid-back and convivial.