Boris Johnson under pressure to say whether Dominic Cummings has requested access to top-secret military sites

Evidence of turf war with defence chiefs over chief aide’s bid to tour highly classified bases – as he seeks to ‘radically shake up the military’

Boris Johnson is under pressure to explain whether Dominic Cummings has demanded access to top-secret military sites, sparking a turf war with defence chiefs.

The controversial chief aide plans to tour Britain’s most highly classified bases as he seeks to “radically shake up the military”, according to documents seen by an Australian newspaper.

The sites include the Special Boat Service in Dorset, the SAS headquarters in Hereford and the Defence Science and Technology Laboratory at Porton Down, which researches chemical weapons and pathogens.

Mr Cummings also wants to visit the Rapid Capabilities Office at Farnborough and the defence intelligence unit at Wyton – having already toured MI5 and MI6 twice, The Sydney Morning Herald reported.

John Healey, the shadow defence secretary, said he feared that the Ministry of Defence (MoD) would be “a bystander” in what was meant to be “the biggest defence review since the Cold War”.

“Plans for Britain’s future defence and security should not be in the hands of a political adviser,” he warned.

And Layla Moran, the Liberal Democrat leadership candidate, said: “Britain’s defence should not be the political plaything of Dominic Cummings. Boris Johnson needs to bench his adviser, for all our sakes.”

According to the documents, the defence secretary, Ben Wallace, has forbidden officials from talking to Downing Street or Mr Cummings about the itinerary for his planned trip.

“The secretary of state explicitly does not wish anyone to engage Number 10 or Dominic Cummings on this,” officials were told, the Herald reported.

“It is for the [minister’s special adviser] and the secretary of state to engage in the first instance before delegating to officials.”

The apparent row comes after fierce criticism of the ousting of Mark Sedwill, the national security adviser – whose replacement, David Frost, a key Johnson ally, lacks experience in intelligence.

Meanwhile, a bitter internal struggle is under way about the UK’s future defence and security capabilities, with suggestions that No 10 will demand big cuts to military personnel.

But Mr Johnson’s political spokesperson defended Mr Cummings’ tour, saying: “He is the prime minister’s senior adviser and so, as you would expect, he regularly visits government sites.

“Similar visits have taken place involving senior advisers under previous governments.”

The tensions were laid bare when Nick Carter, the chief of the defence staff, appeared before the Commons Defence Committee on Tuesday.

Mark Francois, a hard Brexit-backing Tory MP, warned him that Cummings “would sort out” the department in his “own way” if it did not tackle its huge black holes in spending.

Mr Cummings has previously been targeted by Labour over his security clearance, after a whistleblower revealed the time he spent in Russia in his 20s.

Recent photographs – showing his security pass has a green band – suggest that he has now been granted “developed vetting” (DV) clearance, allowing him to view top-secret files without supervision.