If a contract-holder stops paying rent, the landlord is able to serve a possession notice on the basis that they have breached their contract (which has a one-month notice period).
Os bydd deiliad y contract yn rhoi'r gorau i dalu rhent, gall y landlord roi hysbysiad ceisio meddiant ar y sail ei fod wedi torri ei gontract (gyda chyfnod hysbysu o fis).