This Wednesday is the last day of campaigning before the UK's general election, which is expected to produce a major change. According to the latest polls, the opposition Labour Party is predicted to sweep to power with more than 480 seats in the 650-seat parliament. That's far more than even Tony Blair won in his 1997 landslide victory for Labour. The Conservatives, who have been in power for the last 14 years, are predicted to drop to around only 60 seats, which would be the fewest since the party was founded in 1834. In Perspective, we spoke to Nigel Fletcher from King's College London.  He is also co-founder of the Centre for Opposition Studies, an independent research organisation focused on promoting the study of political opposition.