92Detention under sections 90 and 91: place of detention etc
(1)A person sentenced to be detained under section 90 or 91 above shall be liable to be detained in such place and under such conditions—
(a)as the Secretary of State may direct; or
(b)as the Secretary of State may arrange with any person.
(2)A person detained pursuant to the directions or arrangements made by the Secretary of State under this section shall be deemed to be in legal custody.
(3)A direction of the Secretary of State under this section may be signified only—
(a)under the hand of the Secretary of State or an Under-Secretary of State or an Assistant Under-Secretary; or
(b)under the hand of an authorised officer;
and arrangements of the Secretary of State under this section may be signified only as mentioned in paragraph (a) above.