Any notice which under this Part is required or authorised to be given by an employer to an employee may be given by being delivered to the employee, or left for him at his usual or last-known place of residence, or sent by post addressed to him at that place.
Any notice which under this Part is required or authorised to be given by an employee to an employer may be given either by the employee himself or by a person authorised by him to act on his behalf, and (whether given by or on behalf of the employee)—
In this section any reference to the delivery of a notice includes, in relation to a notice which is not required by this Part to be in writing, a reference to the oral communication of the notice.
Any notice which, in accordance with any provision of this section, is left for a person at a place referred to in that provision shall, unless the contrary is proved, be presumed to have been received by him on the day on which it was left there.
Nothing in subsection (1) or (2) affects the capacity of an employer to act by a servant or agent for the purposes of any provision of this Part (including either of those subsections).
In relation to an employee to whom section 173 applies, this section has effect as if—