1. Historical background on prisoner voting is summarised in this House of Commons Standard Note: https://researchbriefings.parliament.uk/ResearchBriefing/Summary/SN01764#fullreport A further paper sets out developments since 2015: https://researchbriefings.parliament.uk/ResearchBriefing/Summary/CBP-7461
7. Under section 4(6) of the Representation of the People Act 1983 a person is a 'qualifying' Commonwealth citizen for registration purposes if they do not require leave to enter or remain in the UK or they do require leave to enter or remain in the UK but have been granted such leave or are treated as having been granted such leave. Any type of leave to enter or remain is acceptable, whether indefinite, time limited or conditional.
8. National Records of Scotland publish information on the breakdown of numbers of citizens of non-EU non Commonwealth countries by local authority area, available at the following link: http://www.scotlandscensus.gov.uk/documents/cde/CT_0202_2011.xlsx