are you on speaking terms with them? is the building as 2 separate properties or 1 thats been converted into 2? do you share the same entrance / front door?
Only seen him once or twice since I’ve moved in and I’ve got a front and back door he has his own fronts door leading to upstairs.
years ago it would of been a house just never bothered to fit another meter for electric and gas upstairs just installed sub meters and estate agents acting like they don’t no about it and I don’t have direct contact for the landlord