19.—(1) The Welsh Ministers may serve a notice on an authority in Wales requiring it to supply to them such information as is specified in the notice and required by them for the purpose of exercising, or deciding whether to exercise, any function relating to schemes.
(2) The authority must supply the information required if it is in its possession or control, and must do so in such form and manner and at such time as specified in the notice.
(3) If an authority fails to comply with paragraph (2), the Welsh Ministers may exercise the function on the basis of such assumptions and estimates as they think fit.
(4) In exercising, or deciding whether to exercise, any function relating to schemes, the Welsh Ministers may also take into account any other available information, whatever its source and whether or not obtained under a provision contained in or made under these Regulations or any Act.