By the early 1970s he was the Commander of the Fraud Squad .[6] He was promoted to Deputy Assistant Commissioner[7] and it was in this role that on 19 July 1972 he began the Poulson investigation.[8] At the time this was the UK's biggest ever corruption inquiry:[9] it eventually led to the resignation of Reginald Maudling, then Home Secretary and notionally in charge of the police. In 1973 Crane arrested Poulson[10] who was later convicted.[11]
As Chief Inspector of the Constabulary, Crane was also involved in investigating the failings of the hunt for the Yorkshire Ripper.[12]
^‘CRANE, Sir James (William Donald)’, Who Was Who, A & C Black, an imprint of Bloomsbury Publishing plc, 1920–2016; online edn, Oxford University Press, 2014; online edn, April 2014 accessed 15 May 2016