An energy assessor who issues any of the documents referred to in paragraph (1) must ensure that the document, and the data which, in accordance with the methodology of calculation of the energy performance of buildings approved by the Secretary of State under regulation F224 of the Building Regulations 2010, was used to calculate any asset rating or operational rating, and to produce the document, is entered onto the relevant register before the assessor gives the document to the person who requested that it be issued.

Any document or data entered onto the register must be kept on the register for a period of at least 20 years beginning on the date on which it is entered onto the register.