For the purposes of section 20, it is a prescribed change if—
(a) a licensee ceases to carry on business as a motor car trader under a name authorised under a licence;
(b) a licensee commences carrying on business as a motor car trader under a name or names in addition to or in substitution for the name of the licensee;
(c) a licensee changes the business address or telephone number of any premises from which a motor car trading business is conducted;
(d) a licensee changes the address of any Internet site maintained by the licensee for the purpose of the motor car trading business.