Throughout Great Britain, there is no statutory right to privacy.
There is the right to a private and family life which was incorporated into the Human Rights Act
but wouldn’t assist here unless you wanted to risk lots of money going to court on an action that is likely to fail.
If you had a tenancy agreement, it is a breach of the landlords covenant (express or implied) for quiet enjoyment (to leave you alone).
In England it could be harassment if it’s part of a course of action or in Scotland, harassment is dealt with as breach of the peace, all of which is done by the police.
Whilst there may be a civil action you could take, to prevent them doing it again, there is probably nothing that you can do in all reality about what has already happened.
If you did decide to take them to court for trespass or invasion of privacy, it’s likely to cost many thousands of pounds with not much of a result.
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