Building Regulations are made for specific purposes, e.g. to provide, in relation to buildings, for the health, safety and welfare of persons, the conservation of energy and access for people with disabilities. Technical specifications (including harmonised
European Standards, European Technical Assessments, National Standards and Agrément Certificates) are relevant to the extent that they relate to these considerations. Any reference to a technical specification is a reference to so much of the specification
as is relevant in the context in which it arises. Technical specifications may also address other aspects not covered by the Regulations. A reference to a technical specification is to the latest edition (including any amendments, supplements or addenda)
current at the date of publication of this Technical Guidance Document. However, if this version of the technical specification is subsequently revised or updated by the issuing body, the new version may be used as a source of guidance provided that
it continues to address the relevant requirements of the Regulations.