This cannabis factory — found in an upmarket Keighley suburb — was among several operated by a trio of Vietnamese drug producers.

Nearly 400 cannabis plants, together valued at more than £60,000, were discovered by police at the house in View Road, Keighley.

“Factories” run by Minh Hein Do, Duc Van Nguyen and Giang Quang Bui were also uncovered at several addresses in Bradford.

Last Thursday, after a two-week trial at Leeds Crown Court, the three men were jailed for a total of just over 17 years.

The jury heard how the gang had rented houses in false names to grow the cannabis.

Do, 48, of Beldon Road, Great Horton, Bradford, was jailed for eight years by the Recorder of Leeds, Judge Peter Collier QC, who said he was significant in the organisation and management of properties being converted into cannabis factories.

Nguyen, 51, and Bui, 54, both of Crescent Walk, Clayton, were each jailed for four years and nine months.

The Recorder told them he was satisfied they played a middle-management role in the conspiracy, rather than being just front-line gardeners. All three had denied conspiracy to produce cannabis.

Duc and Bui were also found guilty of possessing criminal property after they were found with £20,000 in cash and it was recommended they should be deported on their release.

A fourth defendant, Kim Nguyen, 22, also of Crescent Walk, denied conspiracy to produce cannabis and under direction was found not guilty by the jury. After the case, PC Dave Jackson, who led the investigation, said the jail sentences reflected the seriousness of the offences.

He said: “The people involved were of significance. We have prosecuted people at a high level.

“It is massively important we have taken these people out. It reinforces to the public that significant criminals are being investigated and brought to justice.” He urged anyone who suspected a cannabis factory had been set up in their neighbourhood to contact Crimestoppers, anonymously, on 0800 555111.

Police say tell-tale signs include strong smells, curtains permanently drawn, lights switched on at all times and unusual movements of compost and fertiliser into rented houses.