Not later than the date on which notice under paragraph 2 is first published, the local authority must serve a copy of it on every person entitled as lord of the manor or otherwise to the soil of the land unless the local authority is satisfied that the persons entitled to the soil of the land are numerous or cannot after diligent inquiry be ascertained.

A notice under sub-paragraph (1) may be served on any person by sending it in a registered letter addressed to the person at the person's usual or last known address.