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I'm contemplating a scenario where Britain fails to liberalise after George III and where a radicalised Chartist movement only continues to gather steam after 1848. Britain eventually goes to war against the US during the ACW in support of the CSA; a war it 'wins', but which only serves to hasten the Empire's decline. I want to stagger this collapse out as long as possible, with Britain itself finally succumbing to revolution and the various parts of the rest of the Empire having to make their own ways in the world.

What internal changes are necessary in Britain to allow this scenario to come about? What are some plausible PODs to bring about those changes? How would the 19th century be different (primarily from a geopolitical perspective)? What would a 'long collapse' look like for the Empire (again, primarily from a geopolitical perspective)?

Discussion can range from fulfilling this as a challenge, to discussing consequences, to discussing plausibility.
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