Boris Johnson’s controversial enforcer, Dominic Cummings, an architect of Brexit and a fierce critic of Brussels, is co-owner of a farm that has received €250,000 (£235,000) in EU farming subsidies, the Observer can reveal.

The revelation is a potential embarrassment for the mastermind behind Johnson’s push to leave the EU by 31 October. Since being appointed as Johnson’s chief adviser, Cummings has presented the battle to leave the EU as one between the people and the politicians. He positions himself as an outsider who wants to demolish elites, end the “absurd subsidies” paid out by the EU and liberate the UK from its arcane rules and regulations.