Former prime minister Gordon Brown has called for an investigation into Andrew Mountbatten-Windsor's, as he raised concerns over possible use of RAF bases and government flights to visit Jeffrey Epstein. The former Prince Andrew served as a British trade envoy from 2001 until 2011, including for three years while the Scot was in Number 10.

The Sunday Telegraph revealed that Brown sent letters to London, Surrey, Sussex, Thames Valley, Norfolk, and Bedfordshire police forces asking for civil servants who worked with the prince while he was a trade envoy to be questioned. The departments Brown specifically mentions include the Ministry of Defence (MoD), the Department for Transport, the Foreign Office, and the Treasury.

The former PM has also asked for a full investigation into the work the envoy actually performed, and if it had any links with Epstein.

The Telegraph claims that the letters contain “new and additional information,” specifically focusing on worries that Andrew may have chartered RAF aircraft to fly him to meetings with Epstein.

There are also concerns that Epstein flew into RAF bases even after his child prostitution charge in 2008.

Brown is thought to have written about worries that the former prince may have leaked confidential information to the paedophile financier.

Andrew's alleged use of publicly funded flights for private purposes has previously been reported, but records of his journeys were released in the latest Epstein file release and one flight in particular has worried Brown - a flight that landed at RAF Marham in Norfolk in December 2000.

Files show that Epstein and his currently imprisoned associate, Ghislaine Maxwell, flew into Luton Airport, and a day later headed up to the Norfolk base along with two more passengers, including one "unnamed female".

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The Telegraph then claims that Epstein and Maxwell were transported to the Sandringham Estate for entertainment at the then Queen's house - all arranged for by the then-Duke of York.

Brown's letters also include several airports reportedly used by Epstein that he wants to be investigated, including Edinburgh, Belfast, Liverpool, Birmingham, Norfolk, Gatwick, Heathrow, Luton, and Stansted.

The letters have come to light just days after Andrew was arrested at his home on the Sandringham Estate and taken to a small Norfolk police station for questioning.

Mr Mountbatten-Windsor was later released, but detectives are continuing to search his former home, the Royal Lodge.

A spokesman for the Ministry of Defence said that it's normal for commercial and private aircraft to land at RAF locations, as long as it doesn't affect their operations and the users cover the costs.

The spokesman added: “Such use is not automatic and will only be approved when there is no adverse impact to military aircraft and where approval would not interfere with the security or smooth running of the airfield.”