5 Licences
1 A licence granted under this Order shall be in writing and may be—
(a) granted either generally or to one or more particular persons;
(b) granted either absolutely or subject to compliance with such conditions as are specified in the licence;
(c) either of indefinite duration or expressed to expire on a specified date.
2 A licence granted to one or more particular persons may be revoked or varied at any time by written notice given by the relevant enforcement authority to each of those persons.
3 The relevant enforcement authority shall publish a general licence in such manner as it thinks fit. A general licence may be revoked or varied at any time by written notice which shall be published by the relevant enforcement authority in the same manner as the licence.
4 Any person who, in doing or having done an act mentioned in article 3(a) or (b) or 4(1) under the authority of a licence, contravenes or fails to comply with a condition specified in the licence, is guilty of an offence, unless the condition is one imposed as a result of a variation of the licence made without his consent after he did the act.
5 A notice under paragraph (2) may be given by post, and shall be deemed to have been given to a person if it is sent to him at his last-known address.