Regulations under section 149 may require a person ("A") included in—
a pharmaceutical list, or
a list under section 132(3) (provision of drugs, medicines or listed appliances),
not to employ or engage a person ("B") to assist him in the provision of the service to which the list relates unless B is included in a list mentioned in subsection (2).
The lists are—
a list referred to in subsection (1),
a supplementary list,
a list under section 91, 106 or 123,
a list under section 146 or a list corresponding to a list under section 91 prepared by a Primary Care Trust by virtue of regulations made under section 145,
a list corresponding to a list mentioned in any of paragraphs (a) to (d) prepared by a Local Health Board under or by virtue of the National Health Service (Wales) Act 2006 (c. 42),
or, in any of the cases in paragraphs (a) to (e), such a list of a prescribed description.
If regulations do so require, they—
need not require both A and B to be included in lists prepared by the same Primary Care Trust, but
may, in particular, require that both A and B be included in lists prepared by Primary Care Trusts.