When you have a tenancy agreement you have the right to peaceful enjoyment of the property. Just because the landlord owns it, it does not mean he has the right to come in willy nilly without the tenants permission.
Also change the lock. As long has you don't damage it and put the original lock back at the end of the tenancy there is nothing they can do.
Also change the lock. As long has you don't damage it and put the original lock back at the end of the tenancy there is nothing they can do.
