23If at the time when a payment of rebate falls to be made under paragraph 21 or 22 of this Schedule the rating authority have reasonable grounds for believing—
(a)in a case falling within paragraph 16(b)(1) of this Schedule, that an amount equal to the relevant rates has not been paid to the owner of the hereditament; or
(b)in a case falling within paragraph 16(b)(ii) of this Schedule, that an amount equal to the applicant's reckonable rates has not been paid to the occupier of the hereditament in respect of part of which the application is made,
the rating authority may withhold payment of the whole or such part as they think fit of the amount of the rebate, but may, if they think fit, pay any amount so withheld at any subsequent time when they are satisfied that the appropriate amount has been paid as aforesaid.