(1)A constable or cadet of the Police Force may not be a member of a trade union (within the meaning given by section 1 of the Trade Union and Labour Relations (Consolidation) Act 1992 (c. 52)).
(2)Subsection (1) shall not prevent—
(a)membership of the British Transport Police Federation, or
(b)retention, with the consent of the Chief Constable, of a membership status acquired by a person before he joined the Police Force.