Office?!
Looks like it was used for office space, you wouldn't load the ring and a 16a rcbo will do 3.6kW, enough for a large number of computers.
Also if it was used for growing weed cables would of been tacked to a wall and suspended across the room. Putting socket in like that would be too much time and effort.
Its more likely that a health and safety nut told them they couldn't use extension leads when they rigged it for office space.
Biting the hand that feeds IT
