In John Le Carré's Tinker, Tailor, Soldier, Spy, the chief protagonist George Smiley on his way to Heywood Hill antiquarian bookshop at Number 10 Curzon Street, Mayfiar, bumps into Roddy Martingdale, coming out of "Trumper's" (Geo.F.Trumper) the gentleman's barber's next door at Number 9.
Latitude: N51:30:26 (51.507087)
Longitude: W0:08:48 (-0.146673)