The food here reaches gobsmacking perfection: duck magret with fondant potato and foie gras sauce; scallops with cured Iberico ham; John Dory with crushed cocoa beans; and hazelnut soufflé with praline ice cream. The conservatory is highly romantic, plus there's a little courtyard where the last duel in London was fought. The waiters are French, courteous, and friendly. Reservations essential. Tube: Green Park.