ACAS may issue Codes of Practice containing such practical guidance as it thinks fit for the purpose of promoting the improvement of industrial relations or for purposes connected with trade union learning representatives or equality representatives.
In particular, ACAS shall in one or more Codes of Practice provide practical guidance on the following matters—
The guidance mentioned in subsection (2)(a) shall include guidance on the circumstances in which a trade union official is to be permitted to take time off under section 168 in respect of duties connected with industrial action; and the guidance mentioned in subsection (2)(b) shall include guidance on the question whether, and the circumstances in which, a trade union member is to be permitted to take time off under section 170 for trade union activities connected with industrial action.
ACAS may from time to time revise the whole or any part of a Code of Practice issued by it and issue that revised Code.