Tranona
Well-known member
This is a bit incorrect, Brits go to EU for work much more than people think, they also go for holidays as you say but they stay behind for many months working unofficially.
I know having been in and out of Europe in various ways over the last 40 years, but for at least the last 30 years, until 31/12/2020 the Brits you describe were not working "unofficially" as they had a right to work anywhere in the EU they fancied, even if in some states they also had to register locally. I think you vastly overestimate the numbers doing so at any one time, although over time probably millions, mostly young people have done so. As of 1/1/2021 such people will need to become resident if they qualify or get a working visa, or return to the UK.
I would imagine, though most who have chosen not to get residence have returned in the last year, rather like the estimated 250k+ EU citizens who left the UK last year.