Paragraph 16
As soon as practicable after the publication of notice of the referendum, a registration officer must—
notify those peers who are within entry 2, 4 or 5 of the table in paragraph 5(2) or 16(2) of Schedule 3 that they are entitled to vote by post in the referendum;
notify those electors who are within entry 2, 3, 4 or 5 of the table in paragraph 5(3) or 16(3) of Schedule 3 that they are entitled to vote by proxy in the referendum.
A notice given to a peer under paragraph (1)(b) must—
in the case of a peer within entry 2 of the table, state that the peer's entitlement to vote by proxy in the referendum arises by virtue of the peer's inclusion in the list of proxies for a specified poll mentioned in that entry;
in the case of a peer within entry 4 of the table, state that the peer's entitlement to vote by proxy in the referendum arises by virtue of the peer's inclusion in the record kept under paragraph 3 of Schedule 4 to the Representation of the People Act 2000 as voting by proxy at local government elections;
in the case of a peer within entry 5 of the table, state that the peer's entitlement to vote by proxy in the referendum arises by virtue of the peer's inclusion in the record kept under paragraph 3 of Schedule 2 to the European Parliamentary Elections Regulations 2004 (S.I. 2004/293) or (as the case may be) regulation 8 of the European Parliamentary Elections (Northern Ireland) Regulations 2004 (S.I. 2008/1741) as voting by proxy.