12(1)Where at the date when the licence was granted the development as a public off-street parking place of the premises in respect of which the licence was granted had not been begun or had not been completed then, subject to paragraph 13 of this Schedule—
(a)if there has been a period of not less than three years since that date without that development being begun, or
(b)if there has been a period of not less than seven years since that date without that development being completed, or
(c)if for a period of not less than two years beginning with the date of the completion of that development the person, or each of the persons, who was for the time being during that period the holder of the licence has not made any significant number of parking spaces available to the public at the licensed parking place,
the local authority may by notice in writing to the holder of the licence revoke it.
(2)For the purposes of the foregoing sub-paragraph, the development there referred to shall be taken to begin at the earliest date on which any specified operation within the meaning of section 64(3) of the [1967 c. 1.] Land Commission Act 1967 comprised in that development begins to be carried out.