Three County Lines drug dealers jailed

Three drug gang members who were part of a supply network operating in the Welwyn Hatfield area have been jailed for a total of more than 17 years.

They were arrested following an investigation by Hertfordshire Constabulary’s County Lines Investigation Unit, who raided a series of addresses in Borehamwood and Welwyn Garden City in December 2025. During the operation officers seized more than £10,000 in cash, along with half a kilo of cocaine and several bladed weapons.

The trio appeared St Albans Crown Court on Tuesday 29 January, and after pleading guilty, were sentenced as follows:

• Zack Gee, aged 25, of Appletree Way, Welwyn Garden City, was sentenced to eight years and six months for being concerned in the supply of Class A and Class B drugs (cocaine and cannabis) and possession of criminal property (cash)
• Mark Waller, aged 35, of Appletree Way, Welwyn Garden City, was sentenced to five years and eight months for being in possession with intent to supply Class A and Class B drugs (cocaine, MDMA and cannabis), possession of criminal property (cash) and driving whilst disqualified
• Tyrell Campbell, aged 21, of Chaucer Grove, Borehamwood, was sentenced to three years for being concerned in the supply of Class A and Class B drugs (cocaine, MDMA and cannabis)

Detective Sergeant Chris Cowell, from the CLIU, said: “This operation was the culmination of months of work from the CLIU and Case Investigations Unit, which targeted a major drug gang, run by Gee, Waller and Campbell, in Welwyn Garden City and surrounding areas.

“These drug lines are run by organised crime groups who use violence and commit a whole range of crimes that pose a real threat to the community. Our investigations depend on information from members of the public to help us crack down on drug-related crime. Any information you can provide, no matter how small it may seem, could help us to identify and apprehend drug dealers.”

You can report information about a crime online at herts.police.uk/report or speak to an operator in our Force Communications Room via our online web chat, which can be launched here: herts.police.uk/contact. You also call the non-emergency number 101. If a crime is in progress call 999.

Alternatively, you can stay 100% anonymous by contacting the independent charity Crimestoppers on 0800 555 111 or via their untraceable online form at Speak up to stop county lines and exploitation | Crimestoppers.

County Lines Investigation Unit

The County Lines Investigation Unit was launched in 2018 and is made up of officers who specialise in targeting serious and organised crime. Since May 2019 the team has executed hundreds of search warrants, more than 500 arrests and seized over £650,000 in cash. This has led to numerous county lines gangs being dismantled and offenders sentenced to more than 1,000 years in prison in total.