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Adversarial?
The uk has some of the most heavy handed anti-union laws in Europe and looong history of rampant union-busting and (illegal) blacklisting practices across many different sectors – some worse than others (construction bad for the latter).
There was a whole decade of politics (arguably longer) partly defined by a government going to war with the unions because they deemed them too effective and a threat to their agenda.
So yes, there are significant legal and cultural barriers to labour organising because they work.
Yeah I wondered if it was something like this. It's a massively adversarial view of the world, isn't it? And if in practice unionisation is being prevented because capitalist hate it so, then unions aren't working in the broader sense (i.e. getting all workers better conditions)