National Liberal Party (UK 1931) Tags: Political Party.The National Liberal Party known until 1948 as the Liberal National Party was a liberal political party in the United Kingdom from 1931 to 1968. It broke away from the Liberal Party and later merged with the Conservative Party. thumbnail extinction year 1968-01-01T00:00:00+02:00 formation year 1931-01-01T00:00:00+02:00 ideology Liberal conservatism, National liberalism leader John Simon 1st Viscount Simon, David Renton Baron Renton merged into party Conservative Party (UK) split from party Liberal Party (UK) Learn more... Loading...