reg 11 Declaration of conformity and UK marking
(1) Where the conformity of pressure equipment or an assembly referred to in regulation 6 or 7 with the essential safety requirements has been demonstrated by a relevant conformity assessment procedure, the manufacturer must, before placing the pressure equipment or assembly on the market— (a) draw up a declaration of conformity in accordance with regulation 48 ( ... declaration of conformity); (b) affix the UK marking in accordance with regulation 49 (CE marking); and (c) where applicable, ensure that the identification number of the approved body is affixed in accordance with regulation 49. (2) The requirement in paragraph (1)(b) does not apply in cases where— (a) the conformity assessment procedure followed in accordance with regulation 41 is either module A2, C2, F or G; and (b) the conformity assessment procedure has been carried out by a user inspectorate. (3) The manufacturer must keep the ... declaration of conformity up-to-date. (4) Where pressure equipment or an assembly is subject to more than one enactment requiring the drawing up of a declaration of conformity, the manufacturer must draw up a single declaration of conformity which identifies each enactment by its title.