6.—(1) The street authority may by notice in writing served on the licensee withdraw a street works licence—
(a)if the licensee fails to comply with any provision of this Order or any condition of the licence,
(b)if the authority becomes aware that the licensee—
(i)has ceased to use or has abandoned the apparatus, or intends to do so, or
(ii)has parted with or intends to part with his interest in the apparatus in a case where assignment of the licence is prohibited, or
(c)if the authority considers the withdrawal of the licence is necessary for the purpose of the exercise of its functions as street authority.
(2) The withdrawal takes effect at the end of such period beginning with the date of service as may be specified in the notice.
The period shall not be less than 7 working days in the case of a withdrawal under sub-paragraph (1)(a) or (b), and shall not be less than 3 months in the case of a withdrawal under sub-paragraph (1)(c).