Where a member of a police force is fined under the Conduct Regulations, the fine shall, without prejudice to any other method of recovery, be recoverable by way of deductions from the member’s pay during the period of 13 weeks following the imposition of the fine so, however, that the aggregate sum which may be deducted in pursuance of this paragraph in respect of any one week (whether on account of one or more fines) shall not exceed a seventh of his weekly pay:

Provided that in the event of the member leaving the police force, the whole amount of any fine unpaid may be deducted from any pay then due.