In regulation 27 of the principal Regulations (sick leave), there shall be substituted for proviso (b) to paragraph (1) the following proviso:—

“(b)

if, notwithstanding such certificate of unfitness for duty, a registered medical practitioner appointed or approved by the police authority has examined the constable and considers him to be fit for duty, the police authority shall, if the medical practitioner who issued the certificate of unfitness for duty agrees, within 28 days of the difference of opinion coming to their attention arrange for a third registered medical practitioner, acceptable to the practitioner who issued the certificate of unfitness for duty and to the practitioner who has examined the constable on behalf of the police authority, to examine the constable and to report in writing to the other two practitioners concerned; and if the third registered medical practitioner certifies the constable to be fit for duty, or if the medical practitioner who issued the certificate of unfitness for duty does not agree to such further examination, the constable shall no longer be entitled to be absent from duty.”.