A provisional improvement notice, or notice given by an inspector under section 63(3)(b), may be issued or given to a person by—
(a) delivering it personally to the person or sending it by post or facsimile to the person's usual or last known place of residence or business; or
(b) leaving it for the person at the person's usual or last known place of residence or business with a person who is apparently over 16 years and who apparently resides or works there; or
(c) leaving it for the person at the workplace to which the notice relates with a person who is apparently over 16 years and who is apparently the occupier for the time being of the workplace.