Designation of uses of factory, office, shop and railway premises

4.  Subject to article 7 below, the following uses of premises are hereby designated for the purposes of section 1 of the 1971 Act (which requires fire certificates for premises put to designated uses), that is to say–

(a)use as factory premises;

(b)use as office premises;

(c)use as shop premises; and

(d)use as railway premises,

being (in each case) a use of premises in which persons are employed to work.