Many voters felt that the result of the 2001 general election was a foregone conclusion and Labour would win in another landslide. As a result, turnout fell to 59%. Yet in 1992, the closeness of the election saw a 78% turnout.
The choice between the two major parties
In 2017 the Labour Party offered a radically different manifesto from the Conservative Party, which may have encouraged young people to vote in greater numbers.
Salient issues
The issue of Brexit may have encouraged voters on both sides of the debate to vote for candidates and parties who supported their position, ensuring turnout in 2017 was the highest since 1997.