She was Paul’s wife but Linda McCartney had a professional identity of her own. The champion of vegetarianism was also an accomplished photographer. ‘Linda McCartney’s Sixties: Portrait of an Era’ is a collection of pictures that she took during that turbulent decade. It includes portraits of many of the leading musicians of that time – Jimi Hendrix, Janis Joplin, the Rolling Stones and, of course, the Beatles. Shot in stark black and white, McCartney was able to reveal a poignant side to these guarded celebrities.