3.—(1) Any equipment for treating milk as aforesaid shall be provided with control apparatus which, when calibrated as required by sub-paragraph (2) below, will ensure compliance with paragraph 2 above providing no operational change is made or takes place.
(2) Before the equipment is used for treating milk as aforesaid either initially or after any operational change is made or takes place, the control apparatus shall be calibrated in relation to the particular temperature to be used for treating milk as aforesaid so as to determine the control temperatures (being the input temperature, the output temperature and the difference between them which, if respectively maintained, will ensure compliance with paragraph 2 above provided no operational change is made or takes place).
(3) A note of the control temperatures currently applying and of the particular temperature used for treating milk as aforesaid when those control temperatures were determined shall be kept with such equipment and be available at all reasonable times for inspection by any person duly authorised by the licensing authority.