In his latest book, the veteran pop commentator David Hepworth is concerned with satisfaction, its acquisition and maintenance. On record, satisfaction was something the Rolling Stones found notoriously hard to get — ‘an itch you could never quite scratch’. In reality, it was a commodity the groups spearheading the British invasion of the 1960s — the Stones, the Beatles, the Dave Clark Five and others — discovered to be plentiful in the USA.