http://www.legislation.gov.uk/id/uksi/2001/1701

SCHEDULE 6 (ANNEX III to the Directive)

PART BNoise Test Codes for Specific Equipment

The value of the constant K_2A, determined without the artificial surface and in accordance with Annex A of EN ISO 3744:1995, shall be ≤ 2.0 dB, in which case K_2A shall be disregarded.