24Designated establishments
(1)The Secretary of State may by order designate for the purposes of paragraph 5 of the table in section 22 such establishments of the description mentioned in that paragraph as he thinks fit.
(2)An establishment shall not be designated under subsection (1) unless—
(a)it is recognised by the Secretary of State as a polytechnic, or
(b)it is an establishment in respect of which grants are payable out of money provided by Parliament, or
(c)it is assisted by a local education authority in accordance with a scheme approved under section 42 of the [1944 c. 31.] Education Act 1944, or
(d)it provides full-time education for persons who have attained the upper limit of compulsory school age but not the age of nineteen.
(3)A designation under subsection (1) shall remain in force until revoked notwithstanding that the establishment ceases to be within subsection (2).