A policeman stopped the traffic while photographer Iain Macmillan balanced on a stepladder to snap The Beatles striding single-file across Abbey Road’s zebra crossing on August 8, 1969.

Just six photos were taken, but the fifth would go on to form the basis of one of the most iconic album covers in music history, spawning countless imitations and pilgrimages to this day (much to the chagrin of local motorists trying to get past the crossing).

“To have a sleeve that ...