>non authritarian
>goverment
No such thing. You are failing to understand the incentive structures that are set in place as a result of the existence of the state.
First of all, all governments are criminal organizations, thus inherently unethical and authoritarian. It doesn't matter how good the minarchist propaganda is. If the state is not being abolished, we are talking about an authoritarian government.
Second, consider that the entire propaganda apparatus of the state (from BBC to public schools) makes it borderline impossible for people to not only see how evil the whole thing is, but it also makes them actively support it's expansion of power, and see it as a good thing.
Finally, the very nature of democracy can only lead to evermore centralized power, because democracy itself is a result of centralized power. If you fool 51% of voters, you can, eventually, get anything you want within the reaches of the state.
Democracy is a losing game for liberty, no matter how you play it.
I've never been to Britain, but if it's anything like the rest of the west, you'll have to wait for the economical collapse of the government (unless you wanna go full agorist and start doing "illegal" things, which I would only encourage if you have others supporting you). That is the only situation in which governments are forced to shrink their size in general. And even then, you have to keep in mind that the incentive structures that maintain the nature of the state (of ever expanding itself) are still there.
God bless.