Watch: Lorraine shares fears for new series of The Crown
West is set to play the new monarch on the fifth season of The Crown, replacing Josh O'Connor who played a younger Charles in seasons three and four.
Discussing the Netflix show with ITV's news editor Paul Brand, Kelly said: "It’s Dominic West, I mean, he never plays nice. Let’s be honest. He always plays the cad."
Read more: Clarence House concerned about The Crown S5
Brand also talked about the fictional nature of The Crown: "Weirdly, The Crown has been taking on a life of its own. People think that it’s absolutely factual history. It’s based loosely on history, but a lot of it is sort of made up, they fill in the gaps, don’t they?"
He added: "I think particularly in America, people watch The Crown and think, 'Oh wow, what a great, historical, factual documentary.' And no it’s not. So I think King Charles will have to worry about the impression that creates of him."
Read more: Actor who've played The Queen pay tribute
West's own son will also be playing Prince William.
The Crown has previously been criticised for its historical inaccuracies especially regarding the relationship between King Charles III and Princess Diana.
In the upcoming fifth season Diana is to be played by Australian actor Elizabeth Debicki who is best known for her roles in Widows, The Night Manager and The Great Gatsby.
Diana was previously played by newcomer Emma Corrin.
Netflix recently confirmed that the fifth season of The Crown will premiere on 9 November, exactly two months and one day after the death of the Queen.
The new cast lineup includes Imelda Staunton and Jonathan Pryce as Queen Elizabeth II and Prince Philip who have replaced Olivia Colman and Tobias Menzies.
Jonny Lee Miller has also joined the show as former prime minister John Major with Flora Montgomery playing his wife Norma.
The Crown S5 launches on Netflix on 9 November, 2022
Watch below: The Crown season 5: First trailer released