Re: Tim omitted the obvious explanation... @DaveDaveDave
The total is based on counting the same coins multiple times as well as counting stuff that cannot possibly be considered a "subsidy". (Which is also counted at least twice, though I'm not a tax accountant so it might be more than twice)
However, several of the numbers they added up are simply completely wrong - based on false premises.
Anyone can get really big numbers that way, but the result is always meaningless.
I got a tax allowance of £10k and a NIC threshold of £8k so I got £18k subsidy from the government!