http://www.legislation.gov.uk/id/asp/2016/13

http://www.legislation.gov.uk/asp/2016/13/section/1/2020-10-01

Scottish Elections (Dates) Act 2016

An Act of the Scottish Parliament to make provision about the determination of the day of the poll at the first ordinary general election for membership of the Scottish Parliament after 2016 and about the year in which local government elections fall to be held.