Here's the scenario.
"A" rents a property and is solely named on the tenancy agreement. Unbeknown to landlord (and agent who manages the property), he's moved out and sublet to two employees with whom he's subsequently fallen out. Subletees have changed the locks. "A" gave notice a month ago and has just revealed to agent what he's done as he's now worried they won't move out. Agent has visited property but gained no response and now written to occupants saying vacant possession is due this Saturday as tenancy ends then. If subletees don't move out, what is the legal position and what can Landlord do please? TIA.