Although any union is able to represent members at any workplace, it's worth noting that this does affect future claims for recognition (and so collective barga

Although any union is able to represent members at any workplace, it's worth noting that this does affect future claims for recognition (and so collective bargaining rights) for other unions. In particular, if an employer refuses to recognise a union they have a right to apply for 'statutory recognition' through the Central Arbitration Committee - but this can only succeed if there is no other recognised union for that bargaining unit[0]. The GMB are a large, well-established, general union. It wouldn't surprise me if Uber were much keener on having them as the sole recognised union than, say, the Independent Workers' Union of Great Britain[1] - who are also organising Uber workers and are smaller, scrappier, and more militant than the GMB. [0]: https://www.gov.uk/trade-union-recognition-employers/statutory-recognition https://www.gov.uk/trade-union-recognition-employers/statuto... [1]: https://iwgb.org.uk/ https://iwgb.org.uk/