Every incumbent, F1... officer of the Society of Friends, secretary of a synagogue and registrar by whom a marriage register book is kept F2may allow searches to be made in any marriage register book in his keepingF3... F4...

The last foregoing subsection shall apply in the case of a registered building for which an authorised person has been appointed with the substitution for the reference to the incumbent of a reference to the person F5responsible for keeping a marriage register book in accordance with regulations made under section seventy-four of this Act.