reg 40 Presumption of conformity
(1) Pressure equipment or an assembly which is in conformity with a designated standard (or part of such a standard) ... is to be presumed to be in conformity with the essential safety requirements covered by that standard (or that part of that standard). (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (3) The presumption in paragraph (1) is rebuttable.