A certificate purporting to be signed by the plumbing regulator and certifying any of the following is prima facie evidence of the matters certified--
(a) that a stated document is an appointment made under this Act,
(b) that a stated document is a notice, direction or requirement given under this Act,
(c) that a stated document is a copy of a document referred to in paragraph (a) or (b),
(d) that on a stated day, or during a stated period, an appointment as an authorised person was or was not in force for a stated period.