Subsection (1) states that this section and sections 7 and 8 are about the return of regional members at a general election.
Subsection (2) provides for the holding of polls in each constituency, at which an elector may cast a vote (a “regional vote”) for either a registered political party which has put forward a regional list or for an individual candidate for return as a regional member for that region.
The voting system allows the electors to vote for a party that has submitted a regional list but not a particular individual named in it.  The Scottish Parliament (Elections etc.) Order 1999 (S.I. 1999/787) for the rules relating to the publication of the names of those standing in the regional polls.
Subsection (3) provides that the right to vote for a registered political party list or individual in a region is in addition to the right to vote for a constituency candidate.  Electors are, therefore, entitled to cast 2 votes but there is no obligation on them to do so.
Commentary Details of Provisions