Co-founded by Richard Tice and John Longworth, according to the BBC, the organisation grew out of the Vote Leave campaign during the 2016 EU referendum.

[6] As of June 2020, following the withdrawal of the United Kingdom from the European Union, the home page of the group's website declared that it had "achieved its aims when we left the EU on 31st January 2020".

[9] Four ex-cabinet members, including former Chancellor of the Exchequer Lord Lawson, as well as former Brexit minister David Jones,[10] signed the letter alongside the rest of the board.

[12][13] The letter had multiple significant supporters outside of the organisation, including former Conservative leader Michael Howard, who said he shared its "aspirations".

[33] Speakers included Brexit Party chairman, Richard Tice, businessman John Longworth, broadcaster Julia Hartley-Brewer, Spiked editor Brendan O'Neill, Labour MP Kate Hoey, Wetherspoons founder Tim Martin, writer Claire Fox, Conservative MPs Peter Bone and Mark Francois and DUP MP Ian Paisley Jr.[34] A separate pro-Brexit "Make Brexit Happen" rally, organised by the UKIP party formerly led by Farage, was also held nearby.