The United States is not a welcoming place for EU citizens. Immigration is strictly limited, the procedures expensive and time-consuming. If that's the bar for the UK government, the grandparent poster is right: it's not going to be worth even looking at Britain.

To put it another way: if working in London, New York and San Francisco are going to be equally difficult to arrange, I'm not sure why anyone would prefer London. Housing is as expensive as NY or SF, yet wages are much lower. The weather isn't great either.