alternatehistory.com

I've started watching the Netflix series "Designated Person" where a fairly minor US Secretary finds himself president when everyone else in the line of succession is killed.

I know there isn't a fixed protocol for Britain but I was wondering if there were any potentially interesting moments in history where a terrorist attack (IRA perhaps) or accident could lead to interesting Prime Ministers leading (probably emergency) governments

Alternatively, if this has been dealt with, can people recommend timelines dealing with this kind of thing or unlikely PMs.
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