Alexis Gauthier's temple of gastronomy is housed over two floors of a discreet Georgian town house where you have to buzz to be let in. Evening meals are a delight but pricey at £50/60/70 for three/four/five courses. Do what we do and treat yourself to a luxurious weekday lunch for half the price. Try the truffle risotto to start followed by one of the fish dishes, including the signature (Arctic char).