How does capital gains tax actually work on investment portfolios?

Say I have built a portfolio with post-ISA returns of £10,000,000 in the UK. When I withdraw this, I pay 20% (£2 million).

What if I move to the UAE for a year and withdraw it then?

What if I set up a holding company in the UAE to act as an investment manager, and move all assets there?

What if I have a mix of assets bought in the UAE and the UK - will only the assets bought in the UK be taxed?

And finally,

Who do I contact to find out more about this? Personal tax accountant?

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