A journalist and author has told how her Time magazine cover story featuring an interview with Prince Charles was screened by his representatives.

Catherine Mayer, who is editor-at-large of Time, was also subject to the same process when writing her book, published earlier this year, Charles: Heart of a King.

Mayer published the terms and conditions agreed with Clarence House – which also impacted on interviews with other people who know the prince – in the book because, she said, it was her “journalistic duty”.