(1) A responsible authority may, in writing -

(a) authorise such and so many persons as the authority considers necessary to be authorised officers for the purposes of these Regulations, and

(b) revoke any such authorisation.

(2) An appointment under paragraph (1) (a) may be for a specified or unspecified period.

(3) Every authorised officer shall -

(a) be furnished with a certificate of his or her appointment as an authorised officer, and

(b) when exercising a power under these Regulations of an authorised officer, produce the certificate, together with some form of personal identification, if requested to do so by a person affected by the exercise of that power.

(4) An appointment under paragraph (1) of a person as an authorised officer ceases -

(a) when the responsible authority concerned revokes the appointment,

(b) the person dies or resigns from the appointment,

(c) if the appointment is for a specified period, when the period ends,