https://www.reuters.com/article/uk-facebook-cambridge-analytica-brexit/brexit-campaigner-banks-says-cambridge-analytica-pitched-but-we-did-not-hire-them-idUSKBN1GX19P

Brexit campaigner Arron Banks said Cambridge Analytica pitched for work with the Leave.eu campaign ahead of the 2016 Brexit referendum but that ultimately it never did any work - paid or otherwise - for the campaign.