The UK general election in May 2010 produced a hung parliament. When was the previous time that happened?

Question

From and including the general election in the United Kingdom in 2010 how many of the four elections until 2020 were coalition governments?

Answer 1

February 1974
In the UK, hung parliaments have been the result in election in 1885 (when the Irish Parliamentary Party held the balance of power), 1929 (when the Liberals led by David Lloyd George held the balance of power), February 1974 (with the rise of the Liberals under Jeremy Thorpe) and May 2010 (with the rise of the Liberal Democrats under Nick Clegg).