3. In relation to a practice of which a member is on the medical list of a Health Board as well as on that of a Family Health Services Authority, section 18 of the Act shall operate subject to the modification that at the end of subsection (2) there shall be added the words
“or with respect to a practice where—
(a)at least one member of the practice is on the medical list of a Health Board as well as on that of a Family Health Services Authority, and
(b)more patients on the lists of the members of the practice reside in Scotland than in England”.