(1)An employer shall permit an employee of his who is an official of an independent trade union recognised by the employer to take time off during his working hours for the purpose of carrying out any duties of his, as such an official, concerned with—
(a)negotiations with the employer related to or connected with matters falling within section 178(2) (collective bargaining) in relation to which the trade union is recognised by the employer, or
(b)the performance on behalf of employees of the employer of functions related to or connected with matters falling within that provision which the employer has agreed may be so performed by the trade union.
(2)He shall also permit such an employee to take time off during his working hours for the purpose of undergoing training in aspects of industrial relations—
(a)relevant to the carrying out of such duties as are mentioned in subsection (1), and
(b)approved by the Trades Union Congress or by the independent trade union of which he is an official.
(3)The amount of time off which an employee is to be permitted to take under this section and the purposes for which, the occasions on which and any conditions subject to which time off may be so taken are those that are reasonable in all the circumstances having regard to any relevant provisions of a Code of Practice issued by ACAS.
(4)An employee may present a complaint to an industrial tribunal that his employer has failed to permit him to take time off as required by this section.