Briefly, tenants have moved into a property with the landlord's verbal agreement - tenants have until now refused to sign a tenancy agreement and consistently late paying rent, not yet paid a deposit.
Now the landlord wants them out ASAP.
Notice needs to be served, but without a written agreement, what evidence would be required to do a valid notice that a tenancy exists? If it cannot be proven a tenancy exists, can we treat these people as squatters?