Footage shows the moment police discovered one of the UK's largest ever amphetamine factories found on the edge of Warwick district

National Crime Agency investigators identified encrypted messaging platform EncroChat was being used to run the illicit drugs laboratory near Henley-in-Arden.

The drugs lab was capable of producing 400 kilos of amphetamine per month, worth £2 million at wholesale and up to £10 million at street level. The drugs were distributed to dealers in the West Midlands, London and Kent.

Group ringleader John Keet, 41, of Chalfont St Giles in Buckinghamshire, invested profits from a career dealing cocaine, cannabis and amphetamines into building and managing the lab.

He paid for his right hand man, Keith Davis, 62, also of Chalfont St Giles, to undergo chemistry training to enable him to operate the site.

Andrew Gurney, 51, of Quinton, Birmingham, known as ‘The Geek’ due to his specialist electrical installation and plumbing skills, converted what had been a double garage outbuilding into the drugs lab.

Gurney also received the same chemistry training as Davis.

Davis was jailed for five years and three months and Gurney to six years and three months at Kingston Crown Court today (June 10).

Keet is due to be sentenced on August 22.

Work started on the building in March 2020 and it began producing drugs in May of that year. The gang initially bought amphetamine pre-cursor chemical benzyl methyl ketone (BMK) but quickly realised it was more profitable to make it themselves.

NCA officers raided the site in Ullenhall Lane, Henley-in-Arden, Warwickshire, on April 27 last year, with assistance from Warwickshire Police.

Plumes of noxious fumes billowed from the outbuilding when it was opened by specialist crews from West Midlands Fire Service, who had to wait several hours before searching it due to the hazardous chemicals inside. Waste products from the production process, which had been flushed into the sewerage system, had also contaminated a nearby field.

The NCA’s investigation formed part of Operation Venetic, the UK law enforcement response to the July 2020 takedown of the EncroChat encrypted communication service.

NCA Branch Commander Matt McMillan said: “Keith Davis and Andrew Gurney had key roles in running one of the largest drugs laboratories ever found in the UK.

“Under the direction of John Keet, they meticulously planned this criminal enterprise – even undergoing chemistry training to run the laboratory.

“The drugs produced will have fuelled violence, fear and exploitation in communities across the UK.

“Closing down this lab is a great example of multi-agency cooperation to protect the public.”

The gang members were all arrested on suspicion of drug offences at their home addresses on the same day.

Electronic weighing scales were found in Davis’ home, along with 300 kilos of BMK at a storage facility he had access to.

A number of documents and receipts were found in Gurney’s vehicles. These related to heating equipment identified in the lab, weighing scales and chemicals needed for amphetamine production. Officers also found PPE, including respirators and wellington boots which had chemical traces of amphetamine on them.

Davis and Gurney were convicted at Kingston Crown Court on Tuesday (June 8), following a 12-day trial.

Keet pleaded guilty to all the charges at the same court on October 29 last year.