One of David Cameron's top civil servants was allowed to work for Greensill while in Whitehall 

Bill Crothers spent several months as Government procurement head and a Greensill board adviser, it has emerged amid the lobbying scandal around David Cameron grew. https://www.dailymail.co.uk/news/article-9467651/One-David-Camerons-civil-servants-allowed-work-Greensill-Whitehall.html?ns_mchannel=rss&ns_campaign=1490&ito=1490