Marcus Ball was attempting a private prosecution against Boris Johnson’s claims that Britain would £350m a week better once we have left the EU has lost.
Ball was seeking to take the case to the UK’s supreme Court, over claims the prime minister made on the side of the Brexit bus in 2016.
The chair of the US Statistics Authority said the claim was a “clear misuse of official statistics.”
Ball sought an appeal to the court’s decision, but his application was refused by the High Court.
Ball said in a statement, “This is a case of alleged misconduct in public office against the prime minister of the United Kingdom concerning repeated lies about the spending of the public purse.
“It concerns the duties of Members of Parliament and mayors of London and as such goes to the heart of the United Kingdom’s democratic process and public trust in it.
“Yet, according to Lady Justice Rafferty these are not matters of public importance.”