Paying fixed penalty notices

I'd start talking to a legal professional rather than reading bullshit off 'freeman on the land' websites before you find yourself with a criminal conviction and no chance of ever getting credit.

^this. Minor fines might be temporarily avoided simply because, by coming across as an obfuscating, conspiracy-theorist loony, you are seen to be more trouble than your fine is worth. But as far as I'm aware the common law approach has never worked in a serious legal situation i.e., court, and those who have tried have all ended up in contempt of court.