When a participating council have appointed a day for the purposes of Part II (Special treatment premises) of the London Local Authorities Act 1991, they may serve notice on any person registered by them under section 19 (Acupuncturists, tattooists and cosmetic piercers) of the Greater London Council (General Powers) Act 1981 notifying him of the repeal of that section and terminating his registration under that section from a date specified in the notice, being not less than six months after the date of service of the notice.