I was under the impression that if you become tax resident in a non UK jurisdiction, there's no tax like thos. Am I incorrect?
Discussion
This is an exit tax, once paid I then pay tax in the new jurisdiction and no longer have any obligations to the old jurisdiction.
The problem is, I've never sold any Bitcoin, so while I have on paper, made huge gains, I've never realised those gains.
If I wish to leave the UK tax system, I have to pay 20%, soon 39% tax on those unrealised gains.