
"The purpose of this database is to whack money extorted from the taxpayer back into the economy in a way that expands government power and patronage. Same as all government spending. It's perfectly fit for purpose, it's just that the purpose isn't what they're telling us it is."
In that case you might be interested in my modest proposal: http://copsewood.net/writings/kaytax.html . This thin end of a long wedge doesn't deny funding to hospitals and schools, just progressively changes who directs the way taxes are spent from mainly by "them" to mainly by taxpayers.
"all political parties are entirely composed of career politicians, and for a career politician to argue for less tax and more freedom to any meaningful extent would be like an entrepreneur arguing his business needs less revenue."
If this were entirely rather than mainly true ( s/all/most/ ; s/entirely/mainly/ ), my proposal would have zero chance of getting through. Actually it could be got through by a few MPs from a minority party with the balance of power in exchange for giving one of the other parties a lot of what they wanted, as it doesn't immediately impinge on the interests of most of the career politicians out there who tend to become as you claim they all are, and because of this tend to take a pretty short-term view. This weakness could well turn out to be their undoing.