5. Subject to paragraph 4, the proprietor of a food business shall not use any permanent premises for the purposes of that business by ordinarily keeping there relevant moveable premises unless—
(a)those permanent premises are registered in respect of their use for the purposes of that business; or
(b)an application for those premises to be registered in respect of their use for those purposes has been made in accordance with regulation 4(3) to the relevant registration authority at least 28 days before the first day of such use.