6. For regulation 7 of the principal Regulations (qualifications for appointment of deputy chief constable, assistant chief constable, superintendent or chief inspector) there shall be substituted the following regulation:—
“Qualifications for appointment of deputy chief constable, assistant chief constable, superintendent or chief inspector
7.—(1) No person shall be qualified for appointment as deputy chief constable or as assistant chief constable in a police force unless—
(a)he has had at least 2 years' experience in the substantive rank of chief superintendent, or in a higher rank, in a police force, as a central police officer or as a constable assigned to duty with the Scottish Crime Squad before the date on which the appointment shall take effect;
(b)he has been certified by a registered medical practitioner approved by the police authority to be in good health, of sound constitution and fitted both physically and mentally to perform the duties of the rank of deputy chief constable or, as the case may be, assistant chief constable.
(2) No person shall be qualified for appointment as superintendent or chief inspector in a police force unless he has had previous police experience in the rank of inspector.”