4(1)The transfer is necessary for reasons of substantial public interest.
(2)The Secretary of State may by order specify—
(a)circumstances in which a transfer is to be taken for the purposes of sub-paragraph (1) to be necessary for reasons of substantial public interest, and
(b)circumstances in which a transfer which is not required by or under an enactment is not to be taken for the purpose of sub-paragraph (1) to be necessary for reasons of substantial public interest.