40.—(1) A member who, having been retained on duty beyond his normal daily period of duty or engaged on duty away form his usual place of duty, certifies that, by reason of being so retained or engaged, he has been unable to obtain a meal in his usual way and that, as a consequence thereof, he has incurred additional expenditure to obtain food, shall—
(a)if the period for which he is so retained or engaged is not less than two hours but does not exceed five hours, be paid a refreshment allowance;
(b)if the period for which he is so retained or engaged exceeds 5 hours, be paid a subsistence allowance.
(2) A member who, having been retained on duty beyond his normal daily period of duty or engaged on duty away from his usual place of duty, certifies that he has incurred additional expense for the purpose of obtaining lodging which he would not have required if he had not been so retained or engaged shall be paid a lodging allowance.
(3) A member who satisfies the chief constable that during his normal daily period of duty he has, though not away from his usual place of duty, been prevented by the exigencies of duty from obtaining a meal in his usual way and that he has, as a consequence thereof, incurred additional expenditure to obtain food, may be paid a refreshment allowance.
(4) For the purposes of this regulation the expression “usual place of duty” means a member’s police station or other police establishment in which the member is stationed or, where such place of duty has been temporarily changed and after such period from the date of change as the chief constable may determine, in which he is temporarily stationed, as the case may be.
(5) A subsistence, refreshment or lodging allowance payable under the foregoing provisions of this regulation shall be of an amount determined in accordance with Schedule 6.