Holed up alone in a suburban British house thousands of miles from home, cannabis farmer Cuong Nguyen spent months carefully nurturing his plants, one of thousands of Vietnamese migrants working in the UK’s multibillion-dollar weed industry.Cuong – who is now 41 – slipped into Britain illegally, hidden under a lorry before going on to grow cannabis in homes, hotels and even a stable. His dangerous journey from the poor, rough Vietnamese port town of Haiphong to Britain’s illegal cannabis farms…