Thank you. There is an implied covenant (provision) in respect of all tenancies for "quiet enjoyment" the property once a tenancy is granted - Smith v Nottinghamshire CC, Times, 13 November 1981, CA (Civ Div).
what this means is that once the tenancy is provided, the tenant has a right to live at the property without interference from the landlord or anyone acting for him. it is possible for a tenancy agreement to contain provisions for access but those access rights do not trump the common law covenant for quiet enjoyment. In other words, if you say that the landlord cannot access the property and actively object to any access, the landlord cannot use any of the above clauses as a basis to access the property anyway. That would amount to a breach of the protection against eviction act which is both a criminal offence and can give rise to civil damages.
accordingly, the starting point is that you can simply refuse access for the purposes of viewings inspection, or otherwise at your discretion whether that is reasonable or not. It is possible for a landlord to seek an application for an injunction where they can demonstrate that access is necessary for the purposes of statutory obligation such as maintenance or repair and in principle, for the purposes of inspection though usually, a court would not readily grant an injunction for an inspection unless there is a particular reason that the landlord can show as regards ***** ***** inspection is necessary.
notwithstanding the above, excessive amounts of inspections could amount to a breach under the protection against eviction act in its own right if it is shown to be designed or has the result of causing you to give up possession.