Mulligans is straight out of Dublin, right down to the draught Guinness. Downstairs, in the upscale restaurant, order traditional dishes such as roasted partridge and chestnuts or Irish stew with homey accompaniments like champ and colcannon (buttery mashed potatoes with cabbage), then a big rice pudding brûlée with whiskey-soused prunes and Irish coffee cheesecake. Jacket and tie. Tube: Green Park.