(1)Regulations made under section 48 may in particular make provision relating to—
(a)eligibility for appointment as constable or police cadet or for appointment or promotion to a particular rank,
(b)the procedure for appointment of senior officers or for the appointment or promotion of other constables,
(c)periods of service on probation,
(d)the efficiency or effectiveness of constables or police cadets,
(e)restrictions on the private life or business interests of constables or police cadets,
(f)resignation or retirement of constables.
(2)Such regulations—
(a)may provide for appointments of senior officers to be for fixed terms, but
(b)must not provide for fixed term appointment to any rank below that of assistant chief constable.