MI9 builds its drug trafficking gangs around specific people. Each drug deal runs into the hundreds of millions of pounds sterling. MI9 doesn’t do a suitcase load through an airport.
Here’s the origin of a major drug trafficking gang operating on The Jurassic Coast of England. The arrival of each major drugs consignment seems to tie in closely with the murder (sometimes passed off as a suicide) of a named person (e.g. recently, Mercedes Harrison, Thomas Caulfield, Courtney Kilvert, et al).