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ONDON’S MOST EXPENSIVE restaurant has its least visible presence. Sushi Kanesaka lies behind a dark, unmarked wooden door in Mayfair’s 45 Park Lane hotel, the exterior of which also fails to advertise the place. Further confusing matters, the entrance leads off a private room in the hotel’s Bar 45, whose dim, louche, 1950s Italian nightlife vibe clashes with the occasional appearance of a Japanese in traditional dress as she prepares for one of the evening’s two services. At which