Our good friends at Notting Hill Editions run a biennial Essay Competition. Entries are now open for 2017 and close January 9th 2017. Essays must be unpublished and between 2,000 and 8,000 words on any subject. The 2017 prize money is £20,000 to the winner and £1000 each to five runners up.
More info on Judges and how to enter here.