How would be possible so that the British political scene be polarized? I mean so that political assassinations do happen, Britain split into Left-Wing and Right-Wing camps (maybe a third camp, such as Communism for example), governments lasting maybe months or a few weeks, like that. In a sense, so that Britain is unstable.
POD is after 1945 but before 1990.
POD is after 1945 but before 1990.