AV data and research sources
British Academy report: 'Choosing an Electoral System':
The British Academy is the official UK body for academics in the Humanities and Social Sciences, which produces data and research in these fields. Their report on the AV system compares the advantages and disadvantages of the system with other alternatives in use around the world.
http://www.britac.ac.uk/policy/choosing-electoral-system.cfm
Electoral Reform Society:
The Electoral Reform Society is an organisation that has long argued for proportional representation, although it has backed and donated to the YES campaign. Their website contains some details on the perceived advantages and disadvantages of PR.
http://www.electoral-reform.org.uk/article.php?id=5
House of Commons Briefing Paper:
This report from the House of Commons Library gives in depth analysis of the proposed AV electoral system, its history in the UK, and an examination of its advantages and disadvantages.
http://www.parliament.uk/briefingpapers/commons/lib/research/briefings/snpc-05317.pdf
Institute for Public Policy Research (IPPR):
Left-of-centre think tank IPPR's report: "Worst of Both Worlds: why First Past the Post no longer works" gives a history and analysis of the impact of First Past the Post voting on British elections over the last century. The report concludes that AV is preferable to FPTP.
http://fairervotes.3cdn.net/67a826433421addc7d_h2m6be083.pdf
Jenkins Report:
The Jenkins Commission was established in 1997 by the incoming Labour Government to look at possible voting systems to replace the First Past the Post system. It produced an extensive report that analysed a number of different electoral systems, eventually recommending a switch to AV+.
http://www.archive.official-documents.co.uk/document/cm40/4090/contents.htm
No to AV:
Official website for the NO campaign.
Parliamentary Voting System and Constituencies Bill 2010-11:
The particulars of the Bill that brought about the AV Referendum, and information from the committee stages of the Bill.
http://services.parliament.uk/bills/2010-11/parliamentaryvotingsystemandconstituencies.html
?The Constitution Society:
Provides some background, history and context to the British constitution and Parliamentary voting system. It's briefing paper on AV gives some worked examples of how the proposals might work in practice.
http://www.re-constitution.org.uk/
http://www.re-constitution.org.uk/ent/documents/2010/12/09/18/file/Briefing_Paper_AV.pdf