Any question answered...

Landlords may need access to the accommodation to inspect it and do repairs but they must let you live in your home without unnecessary interference. If you are a tenant then your landlord can't come in whenever they feel like it, and should give proper notice and arrange a suitable time if they need to visit. The amount of notice they have to give might be set out in your agreement. If you have a licence, your right to restrict your landlord from coming in is more limited, so get advice before you do anything.

http://england.shelter.org.uk/get_advice/renting_and_leasehold/rights_and_responsibilities/landlords_responsibilities