Bobbies who noticed a “strong smell” while out on the beat had their suspicions confirmed when a subsequent raid uncovered more than 150 cannabis plants.

Officers patrolling Bromley-by-Bow noticed the smell and obtained a search warrant within hours to raid the address it was emanating from.

Cannabis plants were found growing in the bedrooms and living room, with a sophisticated ventilation and irrigation system.

PC Whitwell, who attended Thames Magistrates Court to obtain the search warrant, said: “This was a great result. Someone will be in for a surprise when they discover all their time and effort has been for nothing.”

Officers shut the factory down after forensically examining the premises, and seizing the plants and equipment used for their production.

No arrests have yet been made, but officers said enquiries are ongoing.