Fitting for a show that focuses on possibly the most privileged family in the world, The Crown is also one of the most expensive shows ever made. And this budget emerges in its lavish sets and outfits, and careful attention to period detail, as it chronicles the royal family through various decades. But within the aesthetics, lies the story of a family with drama, class and power struggles - and this truly comes to the fore in Season 4 as the show, set in the Thatcher years, also begins to focus on Prince Charles, and the introduction of Diana Spencer.