I'm in the UK too. But also remote means you can get a job "based" anywhere. Check out some US firms for instance, many are hiring and are happy with euro time zones.
The US companies are hiring, just like everybody else.
Multi-nationals now seem to post most jobs as “remote” which means global. A smaller number is “US-remote”. Usually this is not for tax reasons but for business or security reasons if dealing with the US government.
Hiring remotely is easy for these companies as they usually have a subsidiary already in country.
But even if not, there are now agencies that take care if things like taxation etc. I believe remote.com might be the one most known but it is certainly not the only one.
Very much reflects my experience. I am with a US tech now and they are very conducive to hiring Brits. They know on the whole we hold a lot of quality engineers, there are no language barriers , very little cultural differences at all.
It's a bit of coup out to jump on the British where somehow everything negative that happens is due to Brexit.
As counter anecdata, I am in the Netherlands and I am (now, as much as before) receiving calls for job opportunities from UK based recruiters. They are for the majority concentrated around London, Oxbridge, Bristol, Manchester. Depending on where GP is based in the UK, the landscape and opportunities can be quite different.
Irrespective of the politics and bitter emotions, London's VC funding scene is arguably the closest we have in Europe to SV/Seattle/NY and it will continue to play a role in making the UK relevant in the tech scene.
The person you replied to wrote that all their clients "relocated any technical work they had in the UK to Poland or the Baltics". That's not politics and bitter emotions, that's sharing their own anecdotal data.
Of course, one could criticize generalizing based on that one data point, but that's a different thing altogether.
Saying that Brexit is the cause of something based on one's experience with clients, expressed in a way that suggests that it did not positively or negatively affect themselves in any way, does not strike me as particularly bitter, but suit yourself.
Why remove large groups of skilled engineers in your businesses domain and have to retrain again, because of a political change. I can understand a company with a manufacturing base doing this (due to import / export regulations changing), but this makes no sense in software.