3.—(1) Except as provided by paragraph (2) of this article, any officer employed immediately before the material date by either or both of the old authorities is transferred on the material date to the employment of the new authority, and the contract of employment of that officer is modified so as to substitute as the employer the new authority.
(2) Where—
(a)this article makes provision for the transfer of an officer, and
(b)the officer in question is employed jointly by either or both of the old authorities and another person,
that provision shall have effect to transfer that officer to the employment of the new authority and that other person jointly and the contract of employment of that officer is modified so as to substitute the new authority as one of the joint employers.