11.—(1) Where the Department has reasonable grounds for believing that the areas used for milk production on a holding—
(a)are not as specified in a notice or application submitted pursuant to regulation 8 or 10(1) respectively; or
(b)were not as agreed between the parties at the time of apportionment in a case where no such notice or application has yet been submitted,
it may give notice of this fact to the person who submitted that notice or application, or in the case where neither was submitted, to the transferee.
(2) In any case to which paragraph (1) applies, the apportionment or prospective apportionment of the quota concerned shall be made by arbitration in accordance with Schedule 1.