“The High Court has the power to judicially review decisions in the Crown Court, except in ‘matters relating to trial on indictment’ (s 29(3) Supreme Court Act 1981). The rationale for the exclusion is that judicial review should not be used as a means of delaying trials and clogging up the criminal justice process.”
Law Commission, 30th October 2007
Source: www.lawcom.gov.uk