British Prime Minister Boris Johnson is facing legal action from a cross-party group of MPs and peers including a former national security adviser over the government’s refusal to order an inquiry into Russian interference in UK elections.

The much-awaited publication in July of the Russia Report by parliament’s intelligence and security committee found that the government and its intelligence services had demonstrably failed to investigate allegations of Kremlin meddling in the lead-up to the 2016 EU referendum vote, which was won narrowly by the Leave campaign.

The prime minister’s office simply dismissed the call for an enquiry by saying there was no evidence of successful interference by Moscow.

Lord Peter Ricketts, one of the complainants and the UK government’s national security adviser between 2010 and 2012, said there was a “considerable and growing body of evidence” that Moscow had actively interfered in other western elections, including the 2016 US presidential election and France’s 2017 presidential vote.

Some details contained in the Report were hidden from view in an annex, due to so-called national security concerns.