✔ 最佳答案
This depends on whether there is such a provision in the Tenancy Agreement signed between you and the landlord. If there is none, the landlord is not entitled to enter the flat with propspective tenant or purchaser to view the flat.
If you only have an oral contract with the landlord and do not have a contract in writing. Then, there is implied terms that the landlord shall provide quiet enjoyment to the tenant. Although the landlord has the implied right to enter the flat, it is only limited to enter view the flat to see the condition of the flat and does not include showing the flat to somebody else.
Assuming that there is no agreement to allow the landlord to bring someone else to enter and view the flat, you do have the right to refuse the landlord to show the flat to others. You have such a right no matter whether you have given notice to the landlord to end the tenancy or not. As long as you are still the tenant, you have the right to do so.