Cathryn McGahey KC

Year of Call: 1990 / Year of Silk: 2016

Practice Areas

Cathryn McGahey KC

Year of Call: 1990 / Year of Silk: 2016

Practice Areas


I specialise in immigration, national security, prison law, public inquiries and inquests. I was junior counsel to the Bloody Sunday Inquiry from 2000 to 2010. I became a special advocate in 2008 and was appointed in 2012 to the Attorney General’s A Panel. In 2013 I became a member of the Welsh Government’s A Panel. I was appointed Queen’s Counsel in 2016..


Listed in Chambers and Partners for inquests and public inquiries.

…She is developing a particular specialism in cases concerning child protection.
Strengths: “She has an extraordinary capacity to get on top of the details in a short amount of time.” “She is a very impressive advocate and also a very decent person.” “She is effective and extremely hard-working.” Chambers & Partners 2018

“Routinely instructed as counsel to large public inquiries, she also demonstrates great aptitude when appearing on behalf of participants. She is a skilled representative of state agents in inquests, and has a particular focus on proceedings involving deaths in custody.”
Strengths: “She is exceptionally bright and an excellent advocate.” “A really nice manner when conducting proceedings, which is ideal for harrowing inquiries.” “She is a master at acting for an inquiry and managing a large case.” “Extremely deft witness-handling, she is very astute, strategically minded and calm in court.” Chambers & Partners 2017

Listed in the Legal 500 2017 as a 2016 silk in the fields of immigration, civil liberties and human rights and inquests and inquiries.

Listed in the Legal 500 from 2010 as a leading immigration junior and from 2011 as a leading civil liberties and human rights junior.

“Very impressive; she surely has a bright future as silk”: Legal 500 2017 (civil liberties and human rights)

“Highly regarded”: Legal 500 2017 (immigration)

“Noted for both public inquiries and inquests”: Legal 500 2017 (inquests and inquiries)

“Able to draw on broad public law expertise”: Legal 500 2016

“She has a buoyant immigration and police law practice”: Legal 500 2016

“Well regarded for her work on Bloody Sunday”: Legal 500 2007

“Extremely hard working and very able”: Legal 500 2006

Professional Memberships

Constitutional and Administrative Law Bar Association
Human Rights’ Lawyers Association
Professional Negligence Bar Association


Working knowledge of French and Welsh

BY v District Court in Paphos, Cyprus [2019] EWHC 2637 (Admin)

The Divisional Court (Rafferty LJ and J) found that the father of five children, all of whom have significant medical problems should not face prosecution in Cyprus for a fraud which is said to have taken place in 2016.

Read more

BS v Court of First Instance Brussels (Belgium) [2017] All ER (D) 172 (Mar)

Led by Cathryn McGahey QC. The case dealt with whether a Requesting State had an ongoing duty to consider proportionality throughout the extradition process. After the handing down of judgment, the Judicial Authority withdrew the EAW.

Independent Inquiry into Child Sexual Abuse: Rochdale and Cyril Smith

Cathryn McGahey QC and Emily Wilsdon are representing the Department for Education in this public inquiry. In the Rochdale investigation, the Inquiry is analysing the response of those in authority to allegations of sexual abuse of children by Cyril Smith MP and others, and is investigating in particular allegations of abuse at Cambridge House Boys’ Hostel and Knowl View School.

Independent Jersey Care Inquiry

Cathryn McGahey QC was co-counsel to this public inquiry, which investigated allegations that children in care had been physically and sexually abused over many years, and that their suffering had been covered up. The Inquiry Panel published its report on 3 July 2017. It found that there had been extensive abuse, that the authorities had failed to respond or investigate properly, and that children in care in Jersey might still be at risk.

Rotherham Metropolitan Borough Council v M and Others [2016] EWHC 2660 (Fam)

Cathryn McGahey QC represented South Yorkshire Police. The judge was required to decide whether lifelong anonymity should be granted to four men who in the past had been (but were no longer) alleged to have been involved in sexual exploitation of a minor.

Read more

Secretary of State for the Home Department v LG, IM and JM [2017] EWHC 1529 (Admin)

The Secretary of State had imposed TPIM notices on the three Respondents, alleging that they were senior leaders in the UK of the proscribed Islamist extremist group Al-Muhajiroun. The Court rejected the arguments of two of the Respondents that ALM no longer existed, and rejected the case of the third Respondent that he was no longer associated with it. The TPIM notices were all upheld. Cathryn McGahey QC represented the Secretary of State.

Shabir Ahmed and Others v Secretary of State for the Home Department [2017] UKUT 118

Cathryn McGahey QC represented the Secretary of State in this appeal, in which three members of the Rochdale paedophile ring challenged the Secretary of State’s decision to deprive them of their British citizenship. Their appeals were dismissed. The President of the Upper Tribunal gave guidance on the relevance in deprivation decisions of the prospect that the individual would ultimately be removed from the UK. The case is going to the Court of Appeal.

Bulk Powers Review

Cathryn McGahey QC acted as counsel to this review, which was conducted by David Anderson QC, the Independent Reviewer of Terrorism Legislation. The review investigated the usefulness of some of the powers which the security and intelligence agencies would have, under the Investigatory Powers Bill, to use bulk forms of information in their counter-terrorism work. The review concluded that bulk powers were of substantial utility, and that their use in the past had saved lives.

The Independent Inquiry into Child Sexual Abuse

Andrew O’Connor QC is instructed by the Inquiry to act in the investigation into child sex abuse in Westminster.
Cathryn McGahey QC is Leading Counsel for The Department for Education

R (Detention Action) v Lord Chancellor [2015] EWHC (Admin) 1689

A campaign group, Detention Action, challenged the lawfulness of the secondary legislation governing the appellate procedure under the Detained Fast Track scheme. Cathryn McGahey represented the Secretary of State for the Home Department, an interested party.

R (IS) v Director of Legal Aid Casework and Lord Chancellor [2015] EWHC 1965 (Admin), [2016] EWCA Civ 464

This case involved a challenge to the lawfulness of the LASPO Exceptional Case Funding scheme. Cathryn McGahey acted as first junior counsel for the Defendants at first instance, and as second leading counsel in the Court of Appeal. The Court of Appeal, reversing Collins J, upheld the lawfulness of the scheme.

R (O’Toole and Others) v HMRC [2016: Judgment given but subject to reporting restrictions]

In this Divisional Court case the Claimants challenged, unsuccessfully, the lawfulness of search warrants obtained by HMRC. Cathryn McGahey represented HMRC.

Inquest into the death of Imran Douglas [2015]

The inquest investigated the self-inflicted death of the first 18 year old to be sent to HMP Belmarsh. He was sent there after being sentenced to a minimum of 18 years’ imprisonment for murder, and was found hanging five days later. Cathryn McGahey represented the Youth Justice Board.

Inquest into the death of Ryan Clark

The Inquest investigated the death by hanging of 17 year old Ryan Clark at HMY0I Wetherby. Cathryn McGahey represented The Youth Justice Board.

Inquest into the death of Alex Kelly [2014]

The inquest investigated the self-inflicted death at HMYOI Cookham Wood of 15 year old Alex Kelly. Cathryn McGahey represented the Ministry of Justice.

Lakanal House Fire Inquest

Fire at high rise block of flats in Camberwell caused the deaths of six people. Building Regulations in relation to fire safety and high rise structures were explored. The Inquest was heard at Inner South London Coroners Court – HHJ Frances Kirkham. Cathryn McGahey represented The Department for Communities and Local Government, and The Chief Fire Officer. Fiona Canby was instructed by SGH Martineau. January – March 2013. The Inquest took place from January to March 2013.

R (WGGS) v Secretary of State for the Home Department [2013] EWCA Civ 177

The Claimant college challenged, unsuccessfully, the lawfulness of the SSHD’s policy on the standards that colleges had to meet in order to be granted Highly Trusted Sponsor status. Cathryn McGahey represented the SSHD.

R (Detention Action) v Secretary of State for the Home Department [2014] EWHC 2245 (Admin), [2014] EWCA Civ 1270, [2014] EWCA Civ 1634

Detention Action challenged the lawfulness of the SSHD’s Detained Fast Track policy and practice. The Administrative Court found the practice to be unlawful in one respect, but permitted the DFT scheme to continue. The Court of Appeal upheld the judge’s decision. A differently constituted Court of Appeal held the appeal element of DFT to be unlawful.

R (Secretary of State for Justice) v HM Coroner for the Eastern District of West Yorkshire [2012] EWHC 1634 (Admin)

Cathryn McGahey represented the SSJ in a successful challenge to the Coroner’s decision to leave a verdict of unlawful killing to the jury, in circumstances in which a prisoner had taken his own life. This case remains the leading case on the issue of the test that a coroner should apply when deciding which conclusions to leave to a jury.

R (West London Vocational Training College) v SSHD [2013] UKSC 51, [2013] EWHC 31 (Admin)

The Claimant, a college teaching overseas students, challenged the lawfulness of the SSHD’s policy on the standards that applicants for Highly Trusted Sponsor status had to meet. The College needed such status in order to be permitted to bring foreign students to the UK. The Claimants were unsuccessful, both at first instance and on a “leapfrog” appeal to the Supreme Court. Cathryn McGahey represented the SSHD at first instance and then as junior counsel in the Supreme Court.

Al Sweady Inquiry

The Inquiry investigated allegations that British soldiers in Iraq had murdered certain Iraqi detainees, and physically abused others. Cathryn McGahey represented a number of  whistleblowing soldiers.

The Leveson Inquiry

This was a major statutory public inquiry into the culture, practices and ethics of the press. David Barr served throughout as first junior counsel to the Inquiry. Cathryn McGahey appeared as junior counsel for the Chairman of the Inquiry during related judicial review proceedings. Louise Jones acted for the core participant victims in the judicial review proceedings. William Irwin acted throughout providing legal assistance to Counsel to the Inquiry. Emily Wilsdon assisted in the preparation of the report.

Bloody Sunday Inquiry

The Inquiry investigated the shooting in 1972 by British soldiers of demonstrators in Londonderry.
Cathryn McGahey was second junior counsel to the inquiry from 2000 to 2010.

High Court upholds TPIM on Al-Muhajiroun member

10th July 2020

Cathryn McGahey QC and Nicholas Chapman, instructed by the Treasury Solicitor, successfully represented the Home Secretary in a challenge to her decision to impose a TPIM on “QT”, a member of the proscribed Islamist terrorist organisation Al-Muhajiroun.

Read more

Cathryn McGahey QC and Benjamin Seifert successful in extradition appeal

11th October 2019

Cathryn McGahey QC and Benjamin Seifert, instructed by Jeremy Coleman of DPP Law successfully represented BY on appeal against an order of extradition. The Divisional Court (Rafferty LJ and Jay J) found that the father of five children, all of whom have significant medical problems, should not face prosecution in Cyprus for a fraud which is said to have taken place in 2016.

Read more

3 Members of Chambers appear at preliminary hearing held by IICSA

25th September 2019

On Tuesday 24 September 2019 the Independent Inquiry into Child Sexual Abuse (IICSA) held a preliminary hearing in its investigation into institutional responses to allegations of child sexual abuse involving the late Lord Janner of Braunstone QC.  The preliminary hearing considered directions for the future conduct of the investigation.  A transcript of the hearing can be found at the link below.

Read more

View External Link

Manchester Bombing Inquests

18th October 2018

Today Sir John Saunders, who has been appointed to conduct the inquests into the deaths of those killed in the bombing at the Manchester Arena on 22 May 2017, is holding his first preliminary hearing at the Manchester Town Hall.

Read more

Rochdale Paedophile Gang

13th August 2018

Cathryn McGahey QC and Vinesh Mandalia of No 5 Chambers represented the Home Secretary in an appeal by three members of the Rochdale paedophile gang, who were challenging the Home Secretary’s decision to deprive them of their British citizenship.

Read more

IICSA commences hearings into Rochdale abuse allegations

17th October 2017

Cathryn McGahey QC and Emily Wilsdon are representing the Department for Education before the Independent Inquiry into Child Sexual Abuse. The Inquiry is currently hearing evidence of alleged abuse by Cyril Smith MP and others associated with Cambridge House Boys’ Hostel and Knowl View School.

New Silk for TGC

22nd February 2016

Temple Garden Chambers celebrates the elevation to Queen’s Counsel of Cathryn McGahey

Read more


Thank you for instructing me. I will need to collect and hold your personal information in order to represent you. I will take all reasonable steps to protect your personal information. I will do all that I reasonably can to ensure I do not infringe your rights or undermine your trust. This Privacy Notice describes the information I collect about you, how it is used and shared, and your rights regarding it.


I am registered with the Information Commissioner’s Office (ICO) as a Data Controller for the personal data that I hold and process as a barrister. My registered address is Temple Garden Chambers, 1 Harcourt Buildings, Temple, London, EC4Y 9DA and my registration number is Z4640598.


All of the information that I hold about you is provided to me or gathered solely in the course of and for the purposes of your case, proceedings, public inquiry or any related matter.


  • The General Data Protection Regulation (GDPR) requires all organisations that process personal data to have a Lawful Basis for doing so. The Lawful Bases identified in the GDPR are:
  • consent of the data subject
  • performance of a contract with the data subject or to take steps to enter into a contract
  • compliance with a legal obligation
  • to protect the vital interests of a data subject or another person
  • performance of a task carried out in the public interest or in the exercise of official authority vested in the data controller.
  • the legitimate interests of the data controller, or a third party, except where such interests are overridden by the interests, rights or freedoms of the data subject.


  • where the data subject is a client or in the service of the data controller;
  • transmission within a group of undertakings for internal administrative purposes;
  • processing necessary to ensure network and information security, including preventing unauthorised access;
  • processing for direct marketing purposes, or to prevent fraud; and
  • reporting possible criminal acts or threats to public security.

My Lawful Basis is Legitimate Interest namely the provision of professional services to you and the proper exercise of my professional obligations and responsibilities. My Lawful Bases may also include: consent and/or performance of a contract with you or steps to enter a contract with you and/or compliance with a legal obligation. Insofar as I process sensitive personal data, I do so because it is necessary in relation to legal proceedings and/or for the obtaining or giving of legal advice and/or otherwise for establishing, exercising or defending legal rights and/or for administering justice.


  • to provide legal advice and representation;
  • in the efficient and professional management of my practice as a barrister;
  • to investigate and address any concerns you may have;
  • to assist in training pupils and mini-pupils.

I do not use automated decision-making in the processing of your personal data.

I collect and process both personal data and special categories of personal data as defined in the GDPR. This includes:


  • Email
  • Phone number
  • Address
  • Payment or bank details
  • Date of birth
  • Location details
  • Device IP address
  • Financial information
  • Medical records
  • Employment records
  • Criminal records.


  • my instructing solicitors;
  • my pupil or mini pupil, under my training;
  • opposing counsel and solicitors and their clients for the purposes of your case;
  • A Court or other Tribunal;
  • my Chambers management and staff who provide administrative services;
  • my regulator or legal advisors in the event of a dispute or other legal matter;
  • other third parties where necessary to meet legal obligations;
  • any other party when I have asked you and you consent to the sharing.


Unless you are a client in a third country and I am communicating with you, I do not transfer any personal data to third countries or international organisations.


I retain your personal data while you remain a client and for as long as in necessary for me to meet my legal and professional obligations. My Retention and Disposal Policy (copy available on request) details the length of time for which I hold data for and explains how I dispose of it when it no longer needs to be held.


The General Data Protection Regulation gives you specific rights around your personal data. For example, you have to be informed about the information I hold and the purposes for which I use it, and you can ask for a copy of the personal information I hold about you, you can ask me to correct any inaccuracies with the personal data I hold, you can ask me to stop sending you direct mail, or emails, or in some circumstances can ask me to stop processing your details. Finally, if I do something irregular or improper with your personal data you can seek compensation for any distress you are caused or loss you have incurred. You can find out more information from the ICO’s website and this is the organisation to which you can complain if you are unhappy with the way in which I dealt with your data.


You may request access to, correction of, or a copy of, your information by contacting me in writing at my registered address.


You may opt out of receiving emails and other messages from my Chambers by following the instructions in those messages.


  • Cookies are small text files that are stored on your browser or device by websites, apps, online media, and advertisements. The Chambers website uses cookies to:
  • validate users;
  • remember user preferences and settings;
  • determine frequency of accessing our content;
  • measure the effectiveness of advertising;
  • analyse site visits and trends.


When I make significant changes, I will publish the updated Notice on my website profile.