Why are some Brits so ignorant about our recent history and constitution?
I have seen an answer elsewhere on the history board referring to the fact the the current Prime Minister is 'unelected'. What do they teach in schools today? For a start, under our constitution we do not 'elect' a Prime Minister. By convention, the leader of the majority party in the Houses of Parliament, whoever he/she may be, is asked by the Sovereign to form a Government and hence becomes the Prime Minister.
Further, for there to be a change in mid-term is nothing unusual. In the 20th century there were the following mid-term changes - Asquith/lloyd George, Chamberlain/Churchill. Churchill/Eden, Eden/Macmillan, Macmillan/Home and Thatcher/Major.