Read a little bit about tax residency, you can't just move to Belarus for instance and cash out, you have to be a resident of the country and have tax residency there. If the money involved is big enough I'd hire an accountant to get some real legal advice. Also in UK you have Capital Gain Tax free allowance. I believe it's £11k or something like that, and if you married you can "borrow" allowance from your partner to make it x2. So if you below that threshold just cash out to your UK bank and you don't even have to report it.