The sun seemed to permanently shine on Margaret Street, London, in 1968. Perhaps this was an illusion caused by its position on the precipice of Fitzrovia and Marylebone, with the junction naturally catching more light than the wee, weaving streets that wander towards it. But more likely, its perennial brightness was born from the dazzle of tie-dye-clad hipsters, raucous eccentrics, merchant gangsters, and heavily cologned pop stars who all floc…