2(1)A notice to be served on any person for the purposes of section 260, or of any order or direction made or given under that section, is deemed to have been duly served on the person to whom it is directed if—
(a)it is delivered to him personally, or
(b)it is sent by registered post or the recorded delivery service addressed to him at his last or usual place of abode or place of business.
(2)Where under section 260 or this Schedule a person has power to authorise other persons to act under those provisions, the power may be exercised so as to confer the authority either on particular persons or on a specified class of persons.
(3)Any permit, licence, permission or authorisation granted for the purposes of section 260 or this Schedule may be revoked at any time by the authority or person empowered to grant it.
(4)A document purporting to be duly executed under or by virtue of section 260 or this Schedule and signed by or on behalf of the person making it must be received in evidence and, unless the contrary is proved, taken to be so executed and signed.