Emigrated about 18 years agai and lives in various parts of the US, France and Switzerland. Never looked back, never regretted anything and miss essentially nothing. Well, the odd food/beer or hike in the highlands which i can get a fix with a visit every 3-5 years.
Not that the UK is a bad place. All countries have pros and cons, but so many countries can offer a more. Some combination (but not all) of Better quality of life, better weather, better good, safer, cleaner, higher income, better working rights, better services.
What i love about Switzerland is i earn more, keep more of my money, but the service and infrastructure is leagues ahead of the UK. It is centrally located, so i can make a day trip Italy or France, ski many of the worlds best ski areas within a few hours drive. And everything just works.
Unfortunately the trajectory of the UK looks very grim. Tories are utterly destroying it and their control over the media means they will always be a threat.
If i was to emigrate anywhere else it would probably be Munich