 It was the fourth general election since the devolved parliament was established in 1999 and was held on the same day as elections to the National Assembly for Wales and the Northern Ireland Assembly, as well as English local elections and the UK-wide referendum on the alternative vote.Under the Scotland Act 1998, an ordinary general election to the Scottish Parliament was held on the first Thursday in May four years after the 2007 election.Because of the problems of voter confusion and a high number of spoilt ballots in 2007 due to holding Scottish parliamentary and local elections simultaneously and under different voting systems, the next Scottish local elections were held in 2012 instead of 2011.