An order, notice or other document required or authorised to be served under this Act on any person as a person having control of premises may, if it is not practicable after reasonable enquiry to ascertain the name or address of that person, be served by addressing it to him by the description of “person having control of” the premises (naming them) to which it relates and by delivering it to some person on the premises or, if there is no person on the premises to whom it can be delivered, by affixing it, or a copy of it, to some conspicuous part of the premises.

A document to be served on the person having control of premises, or on the person managing premises, or on the owner of premises under Parts IV, V, VI and VIII may be served on more than one person who comes within those descriptions.