 British, Irish, Commonwealth and European Union citizens living in Scotland who were aged 18 or over on election day were entitled to vote.The deadline to register to vote in the election was midnight on Friday 15 April 2011, though anyone who qualified as an anonymous elector had until midnight on Tuesday 26 April 2011 to register.It was held on the same day as elections for Northern Ireland's 26 local councils, the Northern Irish Assembly and Welsh Assembly elections, a number of local elections in England and the United Kingdom Alternative Vote referendum.