(1) An authority shall not remove from their medical list the name of a Part II practitioner who is performing personal medical services in circumstances mentioned in any of the sub-paragraphs of paragraph (2), unless—
(a) under the pilot scheme in question, he either has his own list of patients, or participates in arrangements under which he and one or more pilot scheme practitioners together have a single list of patients; or
(b) he is, in relation to that pilot scheme, a pilot scheme provider.
(2) The circumstances are—
(a) he has been engaged or employed by a pilot scheme provider (or by a person with whom a pilot scheme provider has made arrangements for that purpose) to perform personal medical services—
(i) temporarily, in place of the pilot scheme practitioner who is normally responsible for the performance of those services (or the Part II practitioner who is normally responsible for performing those services by virtue of sub-paragraph (c)), or
(ii) during periods outside normal hours when no pilot scheme practitioner is available to perform those services;
(b) he performs personal medical services in connection with arrangements under which, outside normal hours, pilot scheme practitioners and Part II practitioners co-operate in such a way that one practitioner will cover for another to secure the performance of personal medical services or, as the case may be, the provision of general medical services for their patients;
(c) he has been engaged or employed by a pilot scheme provider to perform personal medical services for a specified number of hours each week and the authority is satisfied that—
(i) the Part II practitioner has particular skills or experience which would, if he were engaged or employed by the pilot scheme provider, enable the pilot scheme provider to provide the persons to whom personal medical services are to be provided under the pilot scheme with personal medical services which are of greater benefit to them (or any of them) than the services which the pilot scheme provider would otherwise provide; and
(ii) the performance of personal medical services by the Part II practitioner will not adversely affect the provision of general medical services to the persons for whom he is obliged to provide those services.