A man from Chalfont St Giles who was a member of a drug gang has had his prison sentence increased.
Four members of an organised crime group were convicted after they were found to be running one of the largest amphetamine factories ever discovered in the UK.
John Keet, 41, and Keith Davis, 62, both of Chalfont St Giles, together with Andrew Gurney, 51, of Birmingham, and Elliott Walker, 49, of South London, were found guilty of drug offences.
Davis was previously sentenced to five years and three months in prison, and Gurney to six years and three months.
At a hearing on September 21, the Court of Appeal ruled that their previous sentences were unduly lenient, and the judge increased them to 10 years.
National Crime Agency (NCA) branch commander Matt McMillan said: “Davis and Gurney were key players in running one of the largest drugs laboratories ever found in the UK. They carefully planned this criminal enterprise, which was capable of producing 400 kilos of amphetamine per month, worth up to £10million at street level.”