On May 5, voters of London elected a Mayor and a local assembly. Twelve parties entered the Mayoral race. London uses a modified form of instant runoff voting for its mayoral elections. See the wikipedia story about the election. The Labour Party nominee, Sadiq Khan, was elected. He did not have a majority of the first place votes, but the IRV process then counted second place votes and he won. He is the first Muslim to be elected Mayor of a large city in a Christian majority nation in Europe.
In order to receive repayment of the filing fee, a candidate had to poll at least 5% of the first choice votes. The only three parties to recover their filing fee were Labour, Conservative, and Green.