Up to season three of 'The Crown'. We're now well into events and people that I remember from then: the 1964 ad 70 general elections, the Aberfan tragedy, the moon landing, the miners' strike, the death of the Duke of Windsor, etc. There was a wholesale change of cast after season two, which means that Princess Margaret appears to have shrunk, or the Queen grown, since Vanessa Kirby is half a head taller than Claire Foy, but Helena Bonham-Carter is an inch or so shorter than Olivia Colman. Alex Jennings, in series 1 and 2, bore a passing resemblance to the Duke of Windsor, but Derek Jacobi looks nothing like the elderly Duke (but then, DJ looks nothing like anyone else, really, as he has a fairly unusual face).