Where a person sentenced or ordered by a civil court (whether within or without Her Majesty’s dominions)to pay a sum by way of fine, penalty, damages, compensation or costs in consequence of being charged beforethe court with an offence is at the time of the sentence or order, or subsequently becomes, a member of theregular forces, then if the whole or any part of that sum is met by a payment made by or on behalf of anymilitary authority, the amount of the payment may be deducted from his pay.