My son is about to move into a private rental property with a friend. The property is a ground floor flat with window locks. However, he has now had a message from the landlord saying the locks have been disabled at some point, but they are welcome to upgrade them if they want. I would have thought this would be a landlord responsibility. Not least, because presumably there would be nothing stopping them locking all the windows when they leave & taking all the keys. Online advice seems conflicting. The best I can find is the landlord has a responsibility to keep the property secure - although this is largely from locksmith sites!