# Housing Act 2004, Paragraph 2


(1) This paragraph applies where the specified premises in the case of an improvement notice are—
(a) a dwelling which is not licensed under Part 3 of this Act, or
(b) an HMO which is not licensed under Part 2 or 3 of this Act,
and which (in either case) is not a flat.
(2) The local housing authority must serve the notice on whichever of the following the authority considers ought to take the action specified in it—
(a) (in the case of a dwelling) ... the person having control of the dwelling;
(b) (in the case of an HMO) either ... the person having control of the HMO or ... the person managing it;
(c) (in either case) if the premises or any part of them are let under a tenancy that is periodic or was granted for a term of 21 years or less, or are occupied under a licence—
(i) the landlord or licensor;
(ii) any superior landlord or licensor.

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Source: https://www.legislation.gov.uk/ukpga/2004/34/schedule/1/paragraph/2 (the official version)
Page: https://openlegislation.uk/housing-act-2004/schedule-1/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.