Downton Abbey was broadcasted weekly in the UK for seven years and counted Her Majesty, 95, among its loyal fans. Brian Hoey, the author of At Home With The Queen, revealed the historical TV show came up in a 2015 conversation with a worker at Buckingham Palace.
Mr Hoey told The Daily Telegraph: “We were talking about Trooping the Colour and how the Queen always notices if anything is not quite right, such as one young officer she spotted wearing his medals in the wrong order not long ago.
“Apparently, she is exactly the same when she is watching the television.
“She loves watching Downton Abbey and pointing out things they have got wrong, partly because she is familiar with Highclere Castle, where it is filmed.
“She used to stay there as a guest of the Carnarvon family.
“She is the same when she is watching anything on television.
“In one programme she was watching, the Queen noticed that a British officer was wearing medals that were from the wrong era.
“It was set in the First World War, but the medals he was wearing did not come in until the Second World War.”
The acclaimed historical drama ended in 2015 after six seasons and piqued several other royals’ curiosity.
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Actress Vanessa Kirby was also told by a member of the royal family the Queen enjoyed watching The Crown, the Netflix show based on her own life.
Speaking on The Graham Norton Show in 2018, Ms Kirby explained: “A friend of mine was at a party where he didn’t know anyone so sidled up to a group who were discussing the show.
“One of the women said, ‘My granny kind of likes it.’
“It turns out it was one of the princesses – the Queen’s granddaughter.
“It’s quite a reliable source, so I am sure she is a fan!”