The British ruling class has for many years made a habit of grovelling to the Saudi royal family. The reason for this is clear: huge amounts of money. The Saudis have spent billions on British weapons. This trade has been recently given a great boost by the Saudi war on Yemen.
Consequently one was entitled to expect that the BBC4 three-part series, House of Saud: A Family at War, would be very much an apology for the Saudis, celebrating the supposed huge strides that have been made in liberalising the regime in recent years.