10.—(1) At an ordinary election, it is the duty of the CROs and the GLRO to co-operate with each other in the discharge of their functions.
(2) Where a poll is to be taken—
(a)for the return of the London members; or
(b)for the return of the Mayor,
it is the duty of CROs to perform any of the functions they are required to perform by the rules applying to those elections, including verifying the ballot papers at the poll (or each poll if both are to be taken) and counting the votes cast in that poll (or each poll, if both are to be taken).