(cont.)
6) "TYWYSOG CYMRU" (1969) - Prince Charles finally takes center stage as his family sends him out of England yet again for schooling: this time to the ancient town of Aberystwyth to learn from an ardent Welsh nationalist how to speak Welsh as part of the televised ceremony of his formal investiture as Prince of Wales at Caernarvon Castle. We also see something of his life as an undergraduate at Cambridge, where he has become an ardent actor in extracurricular undergraduate productions.
7) "MOONDUST" (1969-1970) - The royal family becomes gripped (along with the rest of the world) with "moon-mania" as the Americans land on the surface of the moon. Philip, in particular, feels a mid-life crisis because he believes this would have been the sort of romantic adventurous thing he might have done himself as a Navy man--and then the Apollo astronauts are all invited to Buckingham palace to be honored by the royal family.
8) "DANGLING MAN" (1971-72) - Prince Charles, frustrated at how life as heir to the throne constantly works to stamp out his personality, makes a secret visit to his great-uncle and great-aunt, the Duke and Duchess of Windsor, at their chateau in France. But he discovers the Duke is dying and in frail health. Will the Queen be able to reconcile with the Duke before he dies? Also, the then-unmarried polo groupie Camilla Shand (who will in 2005 ultimately become the Duchess of Cornwall as Charles's 2nd wife) attracts Charles's attention.
9) "IMBROGLIO" (1970?-73) - Ted Heath becomes Prime Minister as the Conservatives win election, but the queen finds him stuffy and uncommunicative. Prince Charles is confronted by his family about his romantic relationship with Camilla Shand, whom his mother considers an unsuitable possibility as his future queen consort. Meanwhile, Princess Anne has an affair with Charles's polo rival, Major Andrew Parker-Bowles... who also attracts Camilla's romantic attentions...
10) "CRI DE COEUR" (1973-77) - With her marriage on the brink of collapse, Princess Margaret finds solace with a new and much younger love, a gardening-loving baronet's son Roddy Llewellyn, which causes hysterical headlines when the two travel together to her seaside vacation home in the Caribbean. Harold Wilson is returned to power as Prime Minister in 1974, but he has secret news about himself for the Queen. And in 1977, with the economy continuing to stagnate, the Queen prepares for her Silver Jubilee and wonders whether her reign has had any meaning.
(I should note that somewhere in here--I can't tell if it's in episode 5, 6, or 7--Prince Philip gets the family involved in a BBC TV documentary about their life called "Royal Family," which is meant to make them more relatable to the Queen's subjects and does cause a national sensation when it is aired in June of 1969, but does not make the Queen very happy.)