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