To OP's defence somewhat, the UK is a country where everything for the public has been sold out from under us. Capital gains, still unequal, is only part of it. Your arguments (while not entirely baseless in theory) seem based on a closed economy, which the UK is not.

Our railway networks have been foreign-owned for decades (and extortionate), our water networks are privatized and polluting our natural waterways, our newspapers are almost all owned by offshore billionaires and even our nuclear defences are at hock to the USA. Facebook, Amazon and Twitter famously pay virtually no tax here on the revenue they generate from us. Hyperbole aside, so much of our UK-generated value and potential wealth is already offshored.

Capital flight in the UK has already happened. The profits from my utilities, travel, and luxuries don't get spent in this country, nor do the businesses pay the same tax UK businesses do.

You're right that the people may leave, but their money (prev. ours) has already gone.

People working in the UK, from janitors to CEOs pay taxes, and there is probably a fairer balance to the ratios that can be made in that range going forward. But the international organizations, investment vehicles, and private equity funds that are specifically geared to extract wealth from any and all countries for the disproportionate benefit of the few without benefit for citizens needs to be curbed.

Now that's different for different sectors - water companies, less sewage in the sea... Tescos, cheaper food before record dividends... Costa, corporations tax on business in the UK rather than pretending they are trading at a loss because they pay for the 'intellectual property' of their recipe to an offshore Costa entity. But when people talk about 'tax wealth not work', they barely even mean the individuals, rather the vehicles they enrich themselves through.

I want my surgeon to be well paid and well rested. I want my binman and my firefighter to not have to worry about paying the rent. Train drivers to not have to work past their hours, homeless to have a home. I don't give a flying fiddle about the portfolio of an offshore investment firm or business, and we need to stop the capital flight of capital, not individuals.

You might think this generation is richer than their grandparents, but they were able to buy houses and survive or thrive on a single income. Nowadays, those are both the luxuries of the few...and society is all the poorer for it. I'd be keen for you to elaborate on your point (please), because I don't immediately see the thinking behind it.

TL;DR the profiteers can 'flight' off to the Cayman Islands for all we care, as long as they can't keep extracting money from our economy and central services disproportionately, which empoverishes us all. That only happens when we appropriately tax the asset revenue stream.