 This is a purely cosmetic formality that arises from a historical procedure where Her Majesty's Judiciary acted on her behalf in a supervisory capacity.Technically a judicial review is brought by the Crown, on the application of the claimant, to ensure that powers are being properly exercised.Before 2001, judicial review cases were styled "R v Defendant Y, ex parte Claimant X", but this was reformed as part of a general reduction in use of Latin legal terms and due to the fact that such hearings are not, in fact, "ex parte" in any meaningful sense.