Tales of heating controls being put into lock boxes and high draw appliances glued onto time switches are already plentiful. I've also seen questions on how to install controls onto consumer boards (fuse boxes, to us oldies). I'm not sure all landlords deserve sympathy.
I live in a very average 1960s , at the time, new development, very sprawling, quite nice in some ways, but its getting run down, landlords snap up any houses originally brought from the council, they're entry level but big and well built I have several near me, some HMO, one we knew the owner till she moved out and let it via an agent. Many of those houses have lights that never get turned off. Rear of mine is one, family let but the succession of tenants seem to sub let so you get maybe 10 people in there at a time...and the washing that gets put out on the line is relentless, were as sure as you can be they're taking in washing from their community...washing it at the landlords expense.
(We know the agent, we know its supposed to be a family let, not a HMO and we know its bills included) I dread to think how much the bills are, one consolation, they obviously haven't got a tumble dryer