Sophisticated drones sending “overwhelming amounts” of drugs and weapons into prisons represent a threat to national security, according to an annual inspection report by the prisons watchdog.

HMP chief inspector of prisons Charlie Taylor has warned criminal gangs are targeting jails and making huge profits selling contraband to a “vulnerable and bored” prison population.

The watchdog boss reiterated his concerns about drones making regular deliveries to two Category A jails, HMP Long Lartin and HMP Manchester, which hold “the most dangerous men in the country”, including terrorists.

Mr Taylor said “the police and prison service have in effect ceded the airspace” above these two high-security prisons, which he said was compromising the “safety of staff, prisoners, and ultimately that of the public”.

“The possibility now whereby we’re seeing packages of up to 10kg brought in by serious organised crime means that in some prisons there is now a menu of drugs available,” he said. “Anything from steroids to cannabis, to things like spice and cocaine.”

“Drone technology is moving fast… there is a level of risk that’s posed by drones that I think is different from what we’ve seen in the past,” warned the chief inspector – who also said there’s a “theoretical risk” that a prisoner could escape by being carried out of a jail by a drone.

He urged the prison service to “get a grip” of the issue, stating: “We’d like to see the government, security services, coming together, using technology, using intelligence, so that this risk doesn’t materialise.”

The report makes clear that physical security – such as netting, windows and CCTV – is “inadequate” in some jails, including Manchester, with “inexperienced staff” being “manipulated”.

Mr Taylor said there are “basic” measures which could help prevent the use of drones, such as mowing the lawn, “so we don’t get packages disguised as things like astro turf”.

Responding to the report, the Prison Advice and Care Trust (PACT) said: “The ready access to drugs is deeply worrying and is undermining efforts to create places of rehabilitation.”

Mr Taylor’s report found that overcrowding continues to be what he described as a “major issue”, with increasing levels of violence against staff and between prisoners, combined with a lack of purposeful activity.

Some 20% of adult men responding to prisoner surveys said they felt unsafe at the time of the inspection, increasing to 30% in the high security estate.

Andrea Coomber, chief executive of the Howard League for Penal Reform, said: “This report is a checklist for all the reasons the government must prioritise reducing prison numbers, urgently.

“Sentencing reform is essential, and sensible steps to reduce the prison population would save lives.”

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The report comes after the government pledged to accept most of the recommendations proposed in the independent review of sentencing policy, with the aim of freeing up around 9,500 spaces.

Those measures won’t come into effect until spring 2026.

Prisons Minister Lord Timpson said Mr Taylor’s findings show “the scale of the crisis” the government “inherited”, with “prisons dangerously full, rife with drugs and violence”.

He said: “After just 500 prison places added in 14 years, we’re building 14,000 extra – with 2,400 already delivered – and reforming sentencing to ensure we never run out of space again.

“We’re also investing £40m to bolster security, alongside stepping up cooperation with police to combat drones and stop the contraband which fuels violence behind bars.”