Three jailed over £1m-a-year cannabis factory at Kinmel Bay
Mark Graham, James Simpson and Jon Dullighan were jailed at Mold Crown Court on 1 October 2010 after pleading guilty to running one of north Wales’s largest cannabis factories, where police had seized almost 4,700 plants in three industrial units on 18 June 2010.
🇬🇧 Tir Llwyd Industrial Estate, Kinmel Bay, Conwy · United Kingdom
Mark Graham, James Simpson and Jon Dullighan received prison sentences at Mold Crown Court after
admitting their roles in a cannabis production ring that dried and shipped skunk to London and
Birmingham.[1]Graham, 55, of Abergele, was jailed for four years and eight months; Simpson, 34, of
Old Colwyn, for four years; and Dullighan, 29, of Talacre, for two and a half years.[1]
Factory raid
North Wales Police searched three adapted units at the Tir Llwyd industrial estate in Kinmel Bay on
18 June 2010 and seized almost 4,700 cannabis plants.[1][2]Detective Inspector Iestyn Davies said
the force estimated the operation’s output at more than £1 million a year in street value.[1][2]Judge Niclas Parry called it one of the biggest cannabis producers ever found in north Wales and
described the site as a rolling production line.[1][2]Graham and Simpson had been involved for
years and had invested in property from the profits, the judge said, while Dullighan worked as the
gardener who kept the crop growing.[2]Police said a financial investigation would seek to
confiscate assets under drug-trafficking law.[1][2]
Case data
Every number and detail the sources state, with the sources that state it.
North Wales Police estimated annual production worth more than £1 million; the court heard the enterprise had generated large profits but the opened reports give no verified weight in kilograms.
Wales Online’s later account mentions a financial investigation under the Drug Trafficking Act but does not report a confiscation order amount by the time of sentencing.
Graham ran a CCTV business from the units; the sources do not say whether that firm faced separate charges.
Callum Roper, 22, of Holton Road, Barry, was jailed for 30 months at Cardiff Crown Court after admitting offences involving the supply of cannabis and magic mushrooms. He pleaded guilty to being concerned in the supply of both drugs between 3 December 2025 and 14 September 2026 and had been remanded in custody awaiting sentence.
Bolton Crown Court sentenced seven members of three linked drug gangs that trafficked cocaine and cannabis between Manchester, Stoke-on-Trent and North Wales. Five men received prison sentences of up to eleven and a half years, while two couriers received community orders and two leaders await later sentencing.
Daniel Thompson, 36, was found with 8,223.6 grams of cannabis resin, valued at up to £35,950, when officers searched a house on Moss Side Lane in Rixton in July 2023. Chester Crown Court gave him a nine-month prison sentence suspended for 12 months and 100 hours of unpaid work after he admitted possessing the resin with intent to supply and possessing cocaine.
Sentenced 1Cannabis 8.2236 kgPrison 9 months suspended for 12 months
Bradford Crown Court jailed Alfie Leahy, 21, for five years and Connor Broadbent, 26, for three years and four months over drugs found when police raided two homes in the Holmewood area at dawn on 17 July 2026. Cannabis was seized at a Grayswood Crescent address and cocaine, cash and jewellery at Dawson Street; police put the total street value of the drugs at more than £22,000.
Charged 2Prison 5 years (Leahy); 3 years and 4 months (Broadbent)