Iain Stock was snared in February this year after a large scale probe into a mob who planned to flood Scotland with the class B drug.

Stock was on licence at the time having been released early from jail for other drugs offences.

On Tuesday, the 44 year-old pleaded guilty to being concerned in the supply of amphetamine.

Judge Lord Burns locked him for four years and nine months at the High Court in Glasgow.

Stock, of Arden, was part of a Merseyside-based crime group.

Prosecutor Paul Kearney said he was a “trusted associate” of a senior member within the gang. Stock was first linked to a drugs handover on January 15 this year.

A raid later took place at a woman’s house in Dundee and just under £25,000 of amphetamine was discovered. Her phone was also found to have a number save under the name “Scoob” - which was a nickname for Stock.

On January 18, Stock met with Paul Durning before they went to a house in Greenock.

Stock was spotted taking a beer box and a large bag into the property – both filled with amphetamine and a mixing agent.

The consignment had a potential value of £192,000.

The court heard Durning, of Paisley, was later jailed for 30 months for his part in the crime.

The largest seizure of amphetamine was made on February 4 as police continued to keep tabs on Stock.

He was clocked as he travelled down to Liverpool before two men loaded items into the rear of his Ford Transit van. This took place at a disused nursing home which at the time was being renovated by a firm connected to the crime gang.

Stock was later stopped by police on the M74 near Douglas, Lanarkshire as he returned to Scotland. A total of 50 packages of amphetamine were found which had a potential £2.4m value.

The court heard Stock was jailed for three years in 2010 after pleading guilty to drugs offences. He was then handed another 16 months later that year for being concerned in the supply of diazepam.

Lord Burns said the jail-term would have been seven years for this latest crime, but for his guilty plea.

The judge told Stock he appeared to be “trusted” to “transport significant quantities” of drugs for others.