Any notice, request, demand or other instrument under this Act shall be in writing and may be served on the person on whom it is to be served either personally, or by leaving it for him at his last known place of abode in England or Wales, or by sending it through the post in a registered letter addressed to him there, or, in the case of a local or public authority or a statutory or a public utility company, to the secretary or other proper officer at the principal office of such authority or company, and in the case of a notice to a landlord, the person on whom it is to be served shall include any agent of the landlord duly authorised in that behalf.
Unless or until a tenant of a holding shall have received notice that the person theretofore entitled to the rents and profits of the holding (hereinafter referred to as “the original landlord”) has ceased to be so entitled, and also notice of the name and address of the person who has become entitled to such rents and profits, any claim, notice, request, demand, or other instrument which the tenant shall serve upon or deliver to the original landlord shall be deemed to have been served upon or delivered to the landlord of such holding.