Interpretation and General Clauses Ordinance

A copy of a British enactment shall, if
it—
(a)
is published in the Gazette or purports to be printed by the Government
                    Printer; or
(b)
is contained in any printed collection purporting to be published or
                    printed by authority,
be deemed, until the contrary is proved, to be an authentic copy of the
                British enactment as at the date of such publication or printing.