SillyNanny321, how awful to read your experience of the your previous landlord thinking she could enter your property without your permission. That is of course illegal. When one of my sons was at university and renting a student house, the set up being 3 renting in upstairs bedrooms and one in a downstairs lounge which had been turned into a 4th bedroom, the landlord, without any prior discussion, had put plans in place to extend the back of the property whilst the tenants were in situ. So one morning my son and friends were woken up to the noise of machinery in the back garden. The boy in the downstairs room was told he would have to sleep on a sofa in the front room because his room would be affected as the proposed extension was being adjoined to that area. The landlord, assumed because they were a bunch of kids, he could get away with this. The upshot was we, the parents contacted him and told him he was breaking the terms of the lease, that didn't stop him. In the end we had a solicitor friend who contacted the builders direct and told them they would be served with a court order if they didn't stop right away, as the landlord had no right to instruct them, what he was doing was completely illegal. At that point they cleared off and the work ceased. We also notified the university but the landlord was not on their panel of letting agents but they made a note of his name anyway.
Unfortunately there are some shit landlords out there. I would never dream of entering my property when it 's been tenanted, the only exception was when one of my sons and friend were renting and at that time I didn't have a managing agent acting for me. Other than that they make any necessary appointments to inspect through the tenant at a mutually convenient time.