- Britain's own level of freedom doesn't reflect how they've treated colonies in the past. See: all of history.
- The UK isn't as free as many other Western nations. See: their track record on surveillance (although everyone is catching up there), or even Theresa May literally saying "I’ll rip up human rights laws that impede new terror legislation" quite recently.
- Founding documents rarely mean anything when it comes to actual law. See: The US Constitution vs NSA and pretty much everything else the government does.
- Non-Western countries have plenty of freedoms? I'd argue freedom has more to do with economic prosperity, which is typically dominated by colonial powers. See: Japan, Iran before US overthrew government (Iran is now lowest in Economic Freedom Index).
Between this unhinged post and your previous comment "China doesn't represent Anglo Saxon culture or ideals. Canada, NZ, Australia, the UK and the US are the reason we have freedom of everything." I'm getting some really weird vibes, man. You sound delusional and racist.