As someone who works for the company of a person listed on the Times Rich List, I'm very glad he's got richer over the past year.
He is already paying huge amounts of various different taxation (personal, company, NI, etc...) as are all his employees, 90% of whom are based in UK too, where the company began and is based.
Because of the huge risks he took in setting up he company around 15 years ago, huge numbers of people have been employed. And because we made money last year, we are growing company headcount by 50% over the next year (as and when we can find UK graduates with the right skills, which is problematic but a discussion for another day.)
Most of the people we employ are highly educated - I don't know of anyone without a degree who has been hired and most have phds. But all of us create employment ourselves, by hiring nannies or cm and by spending our wages within the UK economy.
I know for certain that if my boss had lost 20% of his wealth over past year, presumably the OP would be jubilent, but as my job would be at risk, we wouldn't be hiring more staff, and the government would be getting substantially less corporation tax from us this year and would have less in the public purse, this would be bad for the country of course. So op's like this really piss me off.