1969–70 - Sub-Editor, Penguin Books; 1970–71 - Editor, McGill-Queens University Press; 1971–76 - Publications Officer, Social Sciences and Humanities Research Council, Canada;[3] 1976–95 - Solicitor, Edward Fail, Bradshaw and Waterson, (Senior Partner, 1985–95); 1993–95 - Vice-Chairman, London Area Committee, Legal Aid Board; 2004–10 - Member, Sentencing Advisory Panel, (Vice-Chairman, 2007–10); 2008–11 - Chairman, Legal Committee, Council of District Judges (Magistrates' Courts); 2012–17 - Member, Editorial Board: Blackstone's Criminal Practice; 2012–17 - Member, Editorial Board: Criminal Law Review, now Honorary Member.
District Judge Riddle (as he then was) presided over a high-profile extradition cases, including: He also tried and/or sentenced high-profile criminal cases, including an unsuccessful private prosecution against Thomas Monson, the president of the Church of Jesus Christ of Latter-day Saints for fraud.
In 2015 Riddle issued search warrants for premises connected to three distinguished and entirely innocent men.
In 2019 Beech was convicted of perjury for these false allegations, and sentenced to a lengthy term of imprisonment.
A report by Sir Richard Henriques, a former High Court judge commissioned by the Metropolitan Police Commissioner, concluded that the judge was correct to issue the warrants on the basis of the information provided to him, but would not have done so had the information provided to him by the police not been misleading.