After section 3—
insert—
'To remove any doubt, it is declared that—
(a) a reference in an industrial instrument under the Industrial Relations Act 1999 to a public holiday is taken to include 2 January, 3 January, 27 December and 28 December when those days are to be observed as public holidays under section 2 or 3; and
(b) a reference in an industrial instrument under the Industrial Relations Act 1999 to a public holiday for the Birthday of the Sovereign is taken to mean the day on which the public holiday is to be observed under section 2 or 3.'.