reg 37 Methods of establishing conformity with the essential requirements
Conformity with the essential requirements may be established in relation to a regulated measuring instrument— (a) through conformity with designated standards (or parts of those standards) covering the essential requirements ...; (b) through conformity with parts of normative documents which cover the essential requirements where the parts of the normative documents have been included in a list published by the Secretary of State ; or (c) through the use by the manufacturer of any other technical solution that complies with the essential requirements.