The head of a large-scale drugs gang and his "trusted lieutenant" have been jailed for dealing cocaine and money laundering, police have said.

Charlie Savage, 27, from Standerwick near Frome, and Shay Girvan, 22, from Station Road, Warminster, were sentenced at Swindon Crown Court on Thursday.

Savage was responsible for distributing 188 kilograms of cocaine, which has an estimated street value of about £18m. He was jailed for 12 years for supplying drugs, while Girvan was jailed for nine years for moving drugs and money around the country.

Savage's meticulous record-taking resulted in Wiltshire Police arresting 30 suspected couriers, customers and suppliers.

The majority are on bail while the Crown Prosecution Service investigates.

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A force spokesperson said Savage headed a large-scale organised drugs gang and was eventually arrested in London when he was found with a rucksack containing more than £65,000 of cash.

Det Con Jared Yalden said Savage was operating at a level above what police would expect for his age, however with "this youth came a degree of naivety".

"Unfortunately for him and his criminal associates, moving cocaine and cannabis in such significant quantities required detailed record keeping to stay on top of the accounts.

"Girvan was a trusted lieutenant, heavily involved in the movement of large quantities of cocaine, cannabis and cash, and his jail sentence reflects his position within the group and the role he played," Yalden added.

Both are now subject to proceeds of crime orders, as police hope to confiscate Girvan and Savage's assets.

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HM Courts & Tribunals Service