 Additionally, over a 17-month period, ending October 2011, Werritty was present at 40 of Fox's 70 recorded engagements.The uncertain nature of Werritty's relationship with Fox led to an investigation by senior civil servants, initially the MoD's Permanent Secretary, Ursula Brennan and latterly the Cabinet Secretary Sir Gus O'Donnell.Fox claimed that Werrity had never worked for him either in an official or unofficial capacity despite allegations that he was using a source of advice outside the Civil Service, paid for by private funds.