The Lanesborough treats grandeur as a matter of course. A Regency landmark at Hyde Park Corner, the hotel keeps seven individually designed private rooms, most lit by natural daylight with views toward Wellington Arch, four of them licensed for civil ceremonies. Dinner can seat up to 250, an in house floral team handles the flowers, and the 93 rooms upstairs hold to the building’s original Regency style. It is London formality done warmly, and done completely.