He said: "Well, I read most of the books about him, and my God, there's a lot of biographers as we saw [in the coverage of] the Queen's funeral. There seemed to be a new one every 10 minutes. I took advantage of the huge research department of 'The Crown'".

Also Read: 'The Crown' star Elizabeth Debicki brings Princess Diana to life on red carpet

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He further mentioned: "They sent me lots of videos, lots of interviews. I mean, it's the thing about him: There's so much on him, and every single moment of his life has been scrutinised and recorded, so there's a lot to go on. He has a farm estate that he rescued in Cornwall and that the Duchy of Cornwall [which operates land holdings on behalf of the British monarch's eldest son] now runs, and you can rent cottages there."

Female First UK further states that 'The Wire' star went on to explain that he stayed in the accommodation for a week so he could "think about" the 73-year-old royal - who is now married to Queen Consort Camilla but has sons Prince William and Prince Harry with the late Princess Diana - and enjoyed the "travel aspect" of the preparation.

Also Read: How 'The Crown' shines a spotlight on Princess Diana's surgeon lover