20. Any person required to keep a register under regulation 19 shall comply with the following requirements, that is to say—
(a)the class of drugs to which the entries on any page of any such register relate shall be specified at the head of that page;
(b)every entry required to be made under regulation 19 in such a register shall be made on the day on which the drug is obtained or, as the case may be, on which the transaction in respect of the supply of the drug by the person required to make the entry takes place or, if that is not reasonably practicable, on the day next following that day;
(c)no cancellation, obliteration or alteration of any such entry shall be made, and a correction of such an entry shall be made only by way of marginal note or footnote which shall specify the date on which the correction is made;
(d)every such entry and every correction of such an entry shall be made in ink or otherwise so as to be indelible;
(e)such a register shall not be used for any purpose other than the purposes of these Regulations;
(f)a separate register shall be kept in respect of each premises at which the person required to keep the register carries on his business or occupation, but subject to that not more than one register shall be kept at one time in respect of each class of drugs in respect of which he is required to keep a separate register, so, however, that a separate register may, with the approval of the Secretary of State, be kept in respect of each department of the business carried on by him;
(g)every such register in which entries are currently being made shall be kept at the premises to which it relates.