Last modified on Mon 26 Apr 2021 16.17 EDT Boris Johnson is isolated in Downing Street with no longstanding trusted aides and at risk of becoming âuncontrollableâ, Tory sources have said after he allegedly personally briefed against Dominic Cummings following confirmation that the prime minister had to foot a £58,000 refurbishment bill. Several insiders who spoke to the Guardian described Johnsonâs two closest advisers, â the cabinet secretary, Simon Case, and Downing Street chief of staff, Dan Rosenfield â as insufficiently politically experienced to handle the toxic briefing wars in No 10. âThe prime minister is being failed here,â one said. âThere need to be interventions from his team but that isnât happening. These are the moments when it matters â having people who can say no. He is surrounded now by people he doesnât particularly trust or particularly know.â