A father recruited his teenage son to sell cannabis which he imported from abroad. He was later found in possession of more than £10,000 worth of the drug when police raided his home.

Mark Glasgow, 43, and his son Niall, 19, were arrested at an address in Newport on October 6 last year after intelligence was received about cannabis supply. Messages on the defendants' phones revealed the father and son had been working in partnership, which involved thousands of pounds worth of cannabis.

A sentencing hearing at Cardiff Crown Court on Tuesday heard Border Force officers intercepted nine packages weighing a total of 3.75kg, which were found to contain cannabis, over a nine month period. As a result of this discovery, Mark Glasgow's mother's address in Newport was raided by police on September 29 last year, where a burner phone, multiple SIM cards and clear plastic bags were discovered.

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On October 6, a further raid took place at Mark and Niall Glasgow's home in Jeddo Street, Newport, where items were seized including mobile phones, a grinder, weighing scales, cannabis wax, £325 in cash, and 767g of cannabis in 11 separate bags. The total value of the drugs involved in the enterprise, except for the drugs seized by Border Force, was between £10,890 and £11,780.

A total of 857 messages relating to cannabis supply was found on a phone belonging to Niall Glasgow. He later admitted being a user of cannabis who obtained drugs from his father. Conversations between the defendants discussed pricing, importation, different strains of cannabis, how not to get caught, and photos and videos of cannabis were sent between them. On occasions, Niall Glasgow had threatened violence against those who he supplied drugs to.

Prosecutor Harriet Ealden said significant sums of money had been passed through the bank account of Mark Glasgow, around £18,000. He later pleaded guilty to possession with intent to supply cannabis, and fraudulent evasion of a prohibition on the importation of cannabis. The court heard he had 20 previous convictions, including possession of crack cocaine in 2007.

Niall Glasgow pleaded guilty to being concerned in the supply of cannabis. He did so on the basis he had been a cannabis user from a young age, and had been provided with cannabis by his father to sell to friends and set up deals, and was given cannabis as recompense. The court heard he is of previous good character. For the latest court reports, sign up to our crime newsletter here

In mitigation for Mark Glasgow, defence barrister Gareth Williams said his client was a father-of-four who had "let himself down" and made bad decisions due to financial debt and difficulties. He said the defendant loved his family and had been separated from them after being remanded in custody. Owen Williams, for Niall Glasgow, said his client was in a different position to his father, played a lesser role in the enterprise, and had been offered an alternative to custody by the probation service.

Addressing Mark Glasgow, Judge Lucy Crowther said: "The very worst thing about this is the way you dragged your son into this, and dragged your son next to you sitting in the dock." The judge said this was a serious aggravating feature. Addressing Niall Glasgow, she described how the defendant had shown "no understanding" of the effects cannabis has on users. The judge added: "Your father treated it as a normal part of your upbringing, you just thought that's what family life was."

Mark Glasgow was sentenced to 24 months imprisonment. Niall Glasgow was sentenced to six months imprisonment suspended for 18 months, and was ordered to carry out 200 hours unpaid work and a 13 day rehabilitation activity requirement.

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