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.
An establishment shall not be designated under subsection (1) unless—
(a) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(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 authority for the purposesof the Education Act 1996, or
(d) it provides full-time education for persons who have attained the upper limit of compulsory school age (construed in accordance with section 8 of the Education Act 1996) but not the age of nineteen.
A designation under subsection (1) shall remain in force until revoked notwithstanding that the establishment ceases to be within subsection (2).