s 151 Interpretation and other supplementary provisions.
(1) References in sections 146 to 150 to being, becoming or ceasing to remain a member of a trade union include references to being, becoming or ceasing to remain a member of a particular branch or section of that union and to being, becoming or ceasing to remain a member of one of a number of particular branches or sections of that union . . . . (1A) References in those sections— (a) to taking part in the activities of a trade union, and (b) to services made available by a trade union by virtue of membership of the union, shall be construed in accordance with subsection (1). (1B) In sections 146 to 150— “ worker ” means an individual who works, or normally works, as mentioned in paragraphs (a) to (c) of section 296(1), and “ employer ” means— in relation to a worker, the person for whom he works; in relation to a former worker, the person for whom he worked. (2) The remedy of a person for infringement of the right conferred on him by section 146 is by way of a complaint to an employment tribunal in accordance with this Part, and not otherwise.