Since 2009, the Conservative Party in the United Kingdom has experimented with the use of open primaries to select some parliamentary candidates.
Two primaries were held ahead of the 2010 general election in Totnes and Gosport. So far at least 12 primaries have been held ahead of the 2015 general election.
Michael Ellis was selected for Northampton North in 2006.
Totnes was the first constituency to use an open primary to select the Conservative Prospective Parliamentary Candidate. The election was held in August 2009 and saw a turnout of approximately 25%. Due to the success of this primary election, David Cameron announced that the system would be applied to other constituencies in future.Dr Sarah Wollaston, a general practitioner, was selected with 48% of the vote. Wollaston went on to be elected MP for Totnes at the 2010 general election.
Gosport held an open primary to select a candidate to succeed Peter Viggers upon his retirement from Westminster. The election was held in December 2009. Caroline Dinenage, a local business owner and daughter of Fred Dinenage, was selected with 38% of the vote. Dinenage was elected MP for Gosport at the 2010 general election, with an increased majority.