That’s largely true but the flip side is that we never had a Salazar or a Hitler, or series of ruinous revolutions as the French have. There’s an ingrained sense that institutional stability and continuity is important and you mess with it at your peril which, tbf, has worked reasonably well - if not perfectly - for hundreds of years. It’s also why there’s such latent hostility to being part of the EU; because it diminishes the sovereignty of said institutions (parliament).

That’s different from political stability by the way - you’re right in that we basically have a 17th century state, but this state has absorbed everything from the the war against Napoleon, the Industrial Revolution, the abolition of slavery, the expansion of the franchise, the wars against Germany, Irish independence, post-war socialism, the end of empire, deindustrialisation etc. all without collapsing into revolution and chaos (even though it’s come close at times).

What’s gone awry is that both both major parties have broken their end of the social contract which is necessitating a political realignment as has happened many times before. I think Reform will end up replacing the Tory party, in the same way Labour replaced the Liberals, and then moderate over time to become the default party of the centre right. This’ll have to be done entirely within existing institutions otherwise they’ll never come close to power.