I believe that there are two mistakes in this quiz. Firstly, Churchill was never President of the UK as the UK does not have a president. He was Prime Minister but the head of state remained the reigning monarch. Secondly, in 2010 the Conservative party won the largest number of seats but fell short of an overall majority and thus ruled in coalition with the Liberal Democrats, with the Conservative leader, David Cameron as PM. That was a victory, no question.
Nice Quiz. Also, you might want to either update (every year) or delete and change the question "The Queen is 93 years old" as people who are doing the quiz many years later (like me), would get confused and would have to go through a whole load of unnecessary thinking to work out how old she was during 2019.