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Sir Keir, at the time Director of Public Prosecutions, was one of its founding members.

In comments expected to be delivered at the summit, the prime minister will refer to working across borders when he was director of public prosecutions to "foil numerous plots", including preventing planes from being "blown up over the Atlantic".

Prime Minister Sir Keir Starmer - who previously sat on the Sentencing Council when he was director of public prosecutions - said he was "concerned" by the guidance.

Director of Public Prosecutions Stephen Parkinson insisted there had not been any national orders not to reveal more details about Rudakubana.

In response, Sir Keir, who was director of public prosecutions between 2008 and 2013, has accused critics of "spreading lies and misinformation" and says he tackled prosecutions "head on".