bitmask & Socrates - the UK is an economic vibrant and trailblazer. An explorer culture that holds her head high. Butt her voice is muzzled and neutered in the EU. How many times have London rulers visited Nairobi since Thatcher? Rules for a large union are always sub-optimal - because they are a balancing act. Economically both the UK and California would be better off on their own. The EU is an economic encumbrance without the payoff. There are too many Polish and Hungarian low-skilled immigrants yet it is harder to attract skilled labor from say India. This disgruntles blue-collars and rednecks much like Latinos do the deplorables in the US. Even in your own corporation, as an expat or high skilled staff the workers' union does not benefit you nor is it wanted.
What unions bestow is group comfort in military and political matters. For instance in dealing with Russia or Iran or Kim Jong-Un. But with NATO that is moot. Canada, Aussie trade with the EU. I am unconvinced of the extra benefit the UK enjoys. The EU is shackles.