Mohammed Miah, 28, and Abdul Khan, 24, set up an operation to ferry substantial amounts of heroin and cocaine from their home city of Bradford to Edinburgh.

They also preyed on vulnerable addicts by offering them free drugs in return for letting them use their homes as bases to co-ordinate their illegal activities – a practice known as “cuckooing”.

At the High Court in Edinburgh, Miah was sentenced to six years and three months in prison while Khan was given a five-year sentence.

A third member of the gang, 22-year-old Jamie Fullalove, who acted as a drugs courier to transport the drugs from England, was served with a community payback order requiring him to be kept under supervision for two years and was ordered to carry out 200 hours of unpaid work

Moira Orr, who leads on homicide and major crime for the Crown Office, said: “This was a coordinated effort to bring significant quantities of illegal and harmful drugs to Scotland through a county lines operation.

“These men are now serving prison sentences thanks to an extensive police operation, working with the Crown Office and Procurator Fiscal Service to investigate a network of drug supply.

“This underlines our commitment to the Serious Organised Crime Taskforce and the country’s Serious Organised Crime Strategy.

“We are targeting all people who threaten communities across Scotland, not only drug couriers but also those who direct their movements. With each case of this kind, we can help reduce the harm these drugs inflict on those communities.”