Police said they were contacted by the 36-year-old bailiff, who had called on a unit in the Westlink Belbins business park, claiming that he was being detained inside by a man who would not unlock the door. The bailiff, from Ferndown in Dorset, also contacted his employer.
When police arrived they freed the bailiff, but the man locked himself inside the unit again.
Police arrested the man as he tried to escape from the back of the building.
Officers found a quantity of herbal cannabis in the business unit.
The bailiff was unharmed during the incident, on Friday at 3pm.
A 53-year-old man from Wandsworth was arrested on suspicion of false imprisonment and being concerned in the supply of cannabis and was bailed until January 28 next year.