Journalist Martin Bashir tricked princess Diana into giving an explosive BBC television interview in which she lifted the lid on her troubled marriage to Prince Charles, an independent investigation concluded on Thursday.

Read more – Prince William welcomes new investigation into Diana’s explosive BBC interview

Retired senior judge John Dyson said Bashir commissioned faked bank statements that falsely suggested some of Diana’s closest aides were being paid by the security services to keep tabs on her.

Bashir then showed them to Diana’s brother Charles Spencer, in a successful bid to convince him to arrange a meeting between himself and Diana and earn her trust.

Dyson said he was “satisfied” that Bashir showed fake bank statements “so as to deceive Earl Spencer and induce him to arrange the meeting with Princess Diana”.

“By behaving as described… Mr Bashir acted inappropriately and in serious breach” of the corporation’s own editorial guidelines on “straight dealing”, Dyson added.

Questions have long been asked about how Bashir convinced Diana to talk on the BBC’s flagship Panorama programme in November 1995, which was watched by a record 22.8 million people and won a string of television awards.

In it, she famously said, “there were three people” in her marriage — her, Charles and his long-time mistress and now wife, Camilla Parker-Bowles — and also admitted adultery.

Diana’s friend, Simone Simmons, told The Sun that the interview had “destroyed her pyschologically” and “made her paranoid”.

Bashir, now 58, was little-known at the time of the interview but went on to have a high-profile career on US television networks, and interviewed stars such as Michael Jackson.

He returned to work for the corporation as religion editor until he stepped down last week, citing ill health, just hours before Dyson’s report was submitted to BBC bosses.

Earlier, a 1996 internal inquiry by future BBC chief Tony Hall and another senior figure, Anne Sloman, cleared Bashir of wrong-doing.

But Dyson called that probe “flawed and woefully ineffective”.

Hall, now chair of the board of trustees at Britain’s National Gallery, admitted that the probe “fell well short of what was required”, and said he was “wrong to give Martin Bashir the benefit of the doubt”.

Meanwhile, BBC director-general Tim Davie said the corporation accepted Dyson’s findings completely and offered a “full and unconditional apology”.

The broadcaster also said it was handing back the awards the programme won for the interview.

Bashir also apologised, saying the faking of the bank statements was “a stupid thing do and was an action I deeply regret”.

But he maintained it had “no bearing whatsoever on the personal choice by Princess Diana to take part”, and he was still “immensely proud” of the interview.

Davie equally said the princess was “keen on the idea of an interview with the BBC”. Her estranged husband had spoken to commercial channel ITV in 1994, and also admitted adultery.

However, he added that “the BBC should have made greater effort to get to the bottom of what happened at the time and been more transparent about what it knew.”

Diana and Charles formally divorced in 1996. She died aged 36 in a high-speed car crash while being chased by paparazzi photographers in Paris the following year. Charles married Camilla in 2005.