The King’s brother should share any information he has about Jeffrey Epstein with US authorities, Sir Keir Starmer has suggested.

The Prime Minister said that while any decision was up to Andrew Mountbatten-Windsor, his “general position is if you have relevant information you should be prepared to share it”.

But it is highly unusual for a PM to discuss potential legal matters relating to the royals.

Mountbatten-Windsor is under pressure to share what he knew about Epstein with a US Congressional committee which is investigating the scale of Epstein’s offending, and who else was involved.

Mountbatten-Windsor has always denied all wrongdoing.

Asked whether Mountbatten-Windsor should help in “any way he can” by reporters on the way to the G20 summit in South Africa, the Prime Minister said: “I don’t comment on his particular case.

“But as a general principle I’ve held for a very long time is that anybody who has got relevant information in relation to these kind of cases should give that evidence to those that need it.

“That would be my general position on this.”

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Asked if that would apply to Mountbatten-Windsor the PM said: “In the end that will be a decision for him.

“But my general position is if you have relevant information you should be prepared to share it.”