'We' (us bored plumbers reading the forum) are stuck here because of various reasons - immigration difficulties, EU bureaucracy, financial dependence on child tax credit system, languages in schools, difficulty in integrating into tight knit traditional societies abroad, UK tax laws governing rental income for ex -pats... Try rocking up in France with a bag of tools and a fist full of British certificates - even if you had the right qualifications, the local business & tax laws would screw you up pretty quick. They don't like it - they have there own ways to keep foreign workers out, even though the EU was supposed to allow everyone to work anywhere.
Would be like early retirement - might get a few hours work now and then fixing some other ex-pat's toilet.
Need a plumbing 'license' to work in US and a lot of other places.
I plumbed ILLEGALLY in South Africa for a couple of years - didn't have the required plumbing license, but I guess with the crime levels there, they probably won't be issuing an extradition warrant in the near future.