This section applies to a patient if—
He shall be treated as if on the date of his arrival at the place where he is to reside in England or Wales—
For these purposes—
"The responsible hospital, in the case of a patient in respect of whom a community treatment order is in force by virtue of subsection (2) above, means the hospital to which he is treated as having been admitted by virtue of that subsection, subject to section 19A above.
As soon as practicable after the patient's arrival at the place where he is to reside in England or Wales, the responsible clinician shall specify the conditions to which he is to be subject for the purposes of section 17B(1) above, and the conditions shall be deemed to be specified in the community treatment order.
But the responsible clinician may only specify conditions under subsection (5) above which an approved mental health professional agrees should be specified.