(2)When any such notice, order or requisition is required or permitted to be served upon an owner, lessee or occupier of any building or land, it shall not be necessary to name the owner, lessee or occupier therein, and the service thereof shall, save as otherwise expressly provided, be effected either-(a)by giving or tendering the notice, order or requisition, or sending it by post, to the owner, lessee or occupier, or, if there are more owners, lessees, or occupiers than one to any one of them; or(b)if no such owner, lessee or occupier can be found, by giving or tendering the notice, order or requisition to the authorised agent if any of any such owner, lessee or occupier, or to an adult member or servant of the family of any such owner, lessee, occupier, or by causing it to be affixed on some conspicuous part of the building or land to which it relates.
