Matthew Stewart Lovell, 49, and Richard Michael Le Cras, 47, admitted four counts of being jointly concerned in the supply of the class A drug MDMA, commonly known as ecstasy, and the class B drugs ketamine, cannabis resin and cannabis.
Lovell also admitted two counts of laundering the proceeds of his crimes, to a total value of £477,775.
Lovell was jailed for a total of 20 years and six months, and Le Cras for 13 years and seven months.
Prosecuting, Advocate Liam Roffey said the crimes were uncovered by a dynamic and detailed investigation by Guernsey Customs and the Economic and Financial Crime Bureau.
Officers kept watch on Ridgeway Vinery in Pointes Lane, where Le Cras rented a unit.
On 11 March last year, the pair arrived at the site in the same vehicle. Le Cras unlocked the unit, and Lovell went in carrying a white package in a latex-gloved hand. He came out holding a similar but smaller package.
On 4 April, Lovell, wearing latex gloves on both hands, went up to a mezzanine in the unit and was seen handling a silver case. Officers later found 252.86g of MDMA in the case.
Lovell put something into the front of his shorts before leaving.
Photos of Lovell and his business cards were found in the unit. He was arrested later that day, and a search of his home found £10,000 in cash and six Rolex watches.
A trailer on the site was linked to Le Cras, and the site owner confirmed Le Cras had put it there and said he had seen him entering it two days earlier.
On 22 May, officers cut the lock off with an angle grinder. Inside was a black metal chest containing 29.4kg of cannabis and cannabis resin and 191.3g of ketamine.
DNA evidence from inside the chest linked both men to the drugs.
Le Cras was arrested the same day, and both exercised their right to silence in interview.
The money laundering charges related to 460 suspicious payments Lovell made at three branches of a local bank. Advocate Roffey said Lovell added references such as ‘car’, ‘birthday’, ‘wedding’ and ‘paint’ when paying money in. This made the deposits look like bank transfers on his statements.
Lovell’s offending dated back to 2019, while Le Cras offended between March and May last year.
Lovell had previous convictions for supplying drugs in 1998, 2008 and 2014, when he was jailed for 63 months. Le Cras had no relevant previous convictions and nothing on his record for the past 30 years.
The pair had been on remand for 17 and 16 months respectively, and defence counsel for both asked for this to be taken into account.