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2. Factsheet: Ballot secrecy, December 2006. The Electoral Commission. https://www.wychavon.gov.uk/component/fileman/file/Documents/Elections/webb-secrecy.pdf
3. May 2006 electoral pilot schemes - postal vote tracking (2006). The Electoral Commission. https://www.electoralcommission.org.uk/sites/default/files/electoral_commission_pdf_file/FindingsPostalVoteTracking_22988-17175__E__N__S__W__.pdf
4. United Kingdom of the Great Britain and Northern Ireland, General Election 2010, OSCE/ODIHR Needs Assessment Mission Report, 19–22 January 2010 (2010). OSCE ODIHR. https://www.osce.org/files/f/documents/3/3/67606.pdf
5. United Kingdom of the Great Britain and Northern Ireland, General Election, 6 May 2010: OSCE/ODIHR Election Assessment Mission Report (2010). OSCE ODIHR. https://www.osce.org/files/f/documents/5/5/69072.pdf