Some data sets for which full preferential voting data are available:
Scottish Council Elections 2007
(East Ayrshire and Glasgow only)
Scottish Council Elections 2012
Scottish Council Elections 2017
Scottish Council Elections 2022
Three seats from the Irish election of 2002
Trustee election for the John
Muir Trust, 2002
(an example of preferential voting allowing equal preferences)
Denis Mollison
updated 19th June 2022
Some papers on implementing STV, and on electoral reform in general:
Community-centred democracy: fine-tuning the STV Council
election system