reg 5 Existing and prohibited practices
(1) In these Regulations, a class or type of practice involving exposure to ionising radiation is an “existing class or type of practice” if either— (a) a practice in that class or type was carried out in the United Kingdom before 6th February 2018 without breaching any requirement not to carry out a practice in that class or type until that class or type had been found to be justified ; or (b) it has been found to be justified; or both. (2) Subject to paragraph (3), a person may carry out a practice, resulting in exposure to ionising radiation, belonging to an existing class or type of practice. (3) No person shall carry out a practice, resulting in exposure to ionising radiation if— (a) it has been determined in the most recent justification decision applicable to that class or type of practice that the class or type of practice to which it belongs is not justified; and (b) the date, specified under regulation 11(2)(a) for ceasing to carry out the practice has passed.