And this is why houses shouldn't be "investments", but treated as homes. Why the housing market in this small overcrowded country with its planning laws pandering to nimbys with the money and power should be regulated.
Crap landlords mess with peoples lives. People "playing" at buy to let with just the odd property to make money out of the housing "market", are the precise people for whom property investment should be taxed through the roof, so they can do somehting more "meaningful" with the cash they have to invest.
If you cant invest in housing for the "long haul" in a business type fashion, and are unable to ride out slumps or lifestyle choices, then you shouldn't.
They may only be "tennants". But they're also people. With friends locally, potentially with kids in schools locally, with personal budgets based on travelling a certain distance to work ect.