29A—(1) The keeper of the register, an accreditation scheme or an energy assessor may disclose assessment data—

(a) in relation to a particular building, to—
(i) the owner, landlord or occupier of that building; or
(ii) a third party with the consent of a person listed in (i);

(b) in relation to an air-conditioning system to which Part 4 applies, to the relevant person.

(2) In this regulation “assessment data” means any data held that was collected during an energy assessment, whether or not that data has been entered onto a register but does not include—

(a) green deal information; or
(b) the name of an individual.

(3) “Energy assessment” has the meaning given in regulation 26.

(4) This regulation does not apply in relation to excluded buildings.

https://www.legislation.gov.uk/uksi/2012/3118/regulation/29A