The Greater London Authority Elections Rules 2000

Challenge of voter

32.—(1) If at any time a person applies for a ballot paper for the purpose of voting in person, or after he has applied for a ballot paper for that purpose and before he has left the polling station, a candidate or his election or polling agent—

(a)declares to the presiding officer that he has reasonable cause to believe that the applicant has committed an offence of personation, and

(b)undertakes to substantiate the charge in a court of law,

the presiding officer may order a constable to arrest the applicant, and the order of the presiding officer shall be sufficient authority for the constable so to do.

(2) A person against whom a declaration is made under this rule shall not by reason of it be prevented from voting.

(3) A person arrested under the provisions of this rule shall be dealt with as a person taken into custody by a constable for an offence without a warrant.