If you keep an eye on the post-millennial London restaurant scene, you might think that to impress a date you had to head for the nearest pop-up supper club serving gourmet pickles, artisanal mocktails and vegan sliders. Au contraire. London still does old-school, tablecloth dining like few other cities on Earth – which is to say extraordinarily well. Exhibit A: Le Pont de la Tour, which is a romantic restaurant in the archetypal sense