6For sub-paragraph (4) of paragraph 19 of Schedule 1 (control of confirming Minister over use of procedure for serving documents where name or address of person to be served unknown) there shall be substituted the following sub-paragraph—
“(4)Where the maker of the order in connection with which the document is to be served is satisfied, after reasonable inquiry, that it is not practicable to ascertain (either or both)—
(a)the name;
(b)the address,
of a person to be served, the document shall be taken to be duly served if, being addressed to that person either by name or by the description of " the owner ", " the lessee " or " the occupier " of the land (describing it) to which the order relates, as the case may be, and being plainly identifiable as a document of importance, it is delivered to some person on the land, or, if there is no such person thereon to whom it may be delivered, it (or a copy of it) is affixed to some conspicuous part of the land.”.