Who is the only Prime Minister in British history to have been assassinated?

The only Prime Minister in British history to have been assassinated is Spencer Perceval. He served as Prime Minister from 1809 until his assassination in 1812. Perceval was shot and killed by John Bellingham, a man with a personal grievance, while entering the House of Commons. His assassination is a unique event in British political history, as no other Prime Minister has met such a fate.

The other choices listed are all significant figures in British politics, but they do not share this particular tragic aspect of history. David Lloyd George, Winston Churchill, and Margaret Thatcher were each prominent Prime Ministers who led the country through important periods; however, none faced assassination during their time in office. Thus, the historical context around Spencer Perceval makes him the only Prime Minister to have been assassinated.