(1) Sub-paragraph (a) of paragraph (1) of regulation three of the principal regulations (which regulation prescribes the circumstances in which the requirements of the principal regulations are to be complied with by users of ignition apparatus forming part of certain internal combustion engines) is hereby revoked, and the following sub-paragraph shall be substituted therefor:
(a) ignition apparatus forming part of an internal combustion engine other than an engine which forms part of an aircraft or of a foreign vessel, except
(i) ignition apparatus which is proved by a person using it within the United Kingdom, or within the territorial waters adjacent thereto, to have been assembled as part of a vehicle, vessel or engine before the 1st day of July, 1953, and
(ii) ignition apparatus which is proved by a person using it within the Channel Islands or the Isle of Man, or within the territorial waters adjacent thereto, to have been assembled as part of a vehicle, vessel or engine before the first day of May, 1957; and
(2) In paragraph (2) of the said regulation three and in proviso (i) to the said paragraph, for the words “the United Kingdom” there shall be substituted the words “the British Islands” .