28. If a constable who is regularly in receipt of an allowance to meet an expense which ceases during that constable’s absence from duty is placed upon the sick list or is on maternity leave [F1, shared parental leave] or adoption leave, the allowance is payable during that constable’s absence from duty up to a period of a month, but thereafter, during the remainder of that constable’s absence from duty, payment may be suspended at the discretion of the chief constable.