As there have been a few posts recently about renting without some type of residency: link
In case it gets cut out, search for news about "Homeowner jailed for harbouring immigration offender".
Bottom line, the landlady was sentenced to 7 months' jail for renting out a bed to an overstayer. (At that price, it won't have been a whole room.)
Apparently it was time to send a message again...