Public Sector Management Act 1994

An employing authority of a department or organisation (in this section referred to as the seconding authority) may, if it considers it to be in the public interest to do so and the public service officer concerned consents, enter into an arrangement in writing with another such employing authority or with an employer outside the Public Sector for the secondment of a public service officer (other than an executive officer) in the department or organisation of the seconding authority to perform functions or services for, or duties in the service of, the other department or organisation or that employer during such period as is specified in that arrangement.