An 80% growth over the last 5 years. Gives you the CAGR to generate the required income from the £200k pot. Dividend yield is irrelevant. Capital growth gives you the income.
You make it all sound so easily achievable, it's not.
First of all you need this pot of £200,000. Only about 3% of UK adults have such savings. Yes, you can generate it with a sale of your house, if you own it.....
The average historical rate has been between 10 and 10.7%. So a rate of 12.5% is highly desirable, but unachievable.
To get near to a 10.4% the £200,000 would have to be invested into high growth assets, which invariably means high risk assets.
Even at 10.4% the growth rate, taken as income, would only yield about £20,000 per year, rather short of a required £25,000, and will never increase with inflation.
And as your pot never grows, it will always be exposed to the high risks endemic in such high risk assets. So invariably your "income" is never dependable.
In addition, you would need to either remain as a UK taxpayer, in which case your income would be subject to the usual taxes, Income tax or CGT, with the costs associated with maintaining that residency,
or register for tax in your chosen country, in which case you would still be subject to income tax or CGT. And many other EU countries impose higher Income Tax and CGT than UK. Also their 'bands' tend to be lower than UK, so it's easy to be subjected to a higher tax band in European countries.
You would also probably need an accountant to complete your tax submission. And you still need Health Insurance, possibly between £50 to £100 per month due to your age.
All these aspects need to be accounted for, and eat into your risky "income".
It isn't as easy as you make it sound.
None of this was necessary pre-Brexit.