A notice affecting land which would have been authorised or required to be served on a person but for his death shall be sufficiently served before a grant of representation has been filed if—
it is addressed to "The Personal Representatives of" the deceased (naming him) and left at or sent by post to his last known place of residence or business in the United Kingdom, and
a copy of it, similarly addressed, is served on the Public Trustee.
The reference in subsection (1) to the filing of a grant of representation is to the filing at the Principal Registry of the Family Division of the High Court of a copy of a grant of representation in respect of the deceased's estate or, as the case may be, the part of his estate which includes the land in question.
The method of service provided for by this section is not available where provision is made—
by or under any enactment, or
by an agreement in writing,
requiring a different method of service, or expressly prohibiting the method of service provided for by this section, in the circumstances.