reg 9 Compliance procedures for series production
(1) A manufacturer of a product which is manufactured by series production must ensure that, before placing a product on the market, procedures are in place to ensure that any product so manufactured will be in conformity with Part 2. (2) In doing so, the manufacturer must take adequate account of— (a) any change in the product design or characteristics, and (b) any change in a designated standard or in another technical specification by reference to which the ... declaration of conformity or attestation of conformity was drawn up.