'Extremist' Salmond mocked for enlisting Robert the Bruce Cameron scandal puts spotlight on revolving door between politics and business Sir John Major urges ethics rules overhaul after Cameron Greensill row LibDems accused of breaking mourning pledge day after Prince Philip's death Coronavirus latest news: 1.3 million vulnerable people yet to take up offer of vaccine in England Subscribe to The Telegraph for a month-long free trial Boris Johnson has refused to give David Cameron his backing over the Greensill Capital scandal, saying he has his own questions about what happened. The Prime Minister yesterday ordered lawyer Nigel Boardman to head up an inquiry into how the finance firm secured state contracts for supply chain finance The probe will also look at how the lender’s representatives, including Mr Cameron, "engaged with Government". Asked what he made of his predecessor's behaviour the Prime Minister told journalists: "That's a matter for Nigel Boardman's report." Pressed on whether he is attempting to "rough up a rival" with the review, Boris Johnson said: "I think people have got questions that they need to satisfy themselves about - including me - about how this supply chain finance stuff is meant to work. "I don't think it is going on at present anywhere in Government but we need to understand exactly what the intention was, how it came about, and that is exactly what Nigel Boardman is going to do." Matt Hancock, the Health Secretary, admitted he had met Mr Cameron and Lex Greensill socially, but insisted he had referred the meeting to officials after "department business" came up. Meanwhile Kwasi Kwarteng, the recently-appointed Business Secretary, told a committee of MPs that he "never received a phone call or WhatsApp" from Mr Cameron.