"Lots are Chevening scholars or are funded by their governments."
According to their own website:
"Chevening Scholarships enable outstanding emerging leaders from all over the world to pursue one-year master’s degrees in the UK."
That's not your typical undergraduate student doing a three year BA degree in Business Studies though, is it?
"...or are funded by their governments"
Are you perhaps talking about something like the Indian 'National Overseas Scholarship' programme that supports students from certain castes to get a Masters or PhD overseas?
Again, this is very different from an ordinary undergraduate course.
"A lot self fund masters courses after 20 year careers in the UN or business orgs."
Are you perhaps talking about an MBA or a similar type of course?
Once again, as I said, that is a very different cohort indeed than those doing a three year undergraduate degree and it is not at all comparable.
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The correct comparator to an 18 year old British person thinking about attending a British university to do a first degree would be an overseas student also wanting to attend a British university to do a first degree.
The university I attended currently has 46% UK undergraduates, 8% from the EU and 46% international undergraduates (according to UCAS).
More than half of all those international students come from China (source HESA).
The next two largest countries are Hong Kong and the USA.
Also, despite international students making up only 46% of undergraduates they account for almost 80% of tuition fee income.
Chinese (as well as Hong Kong, American etc) undergraduates studying in the UK are not (generally speaking) being paid for by their governments. The vast majority are being funded by their families.