Benjamin is a specialist extradition and public law practitioner.

He has appeared in the Supreme Court, Court of Appeal, High Court, Crown Court, County Court, Magistrates’ Court, the Upper Tribunal and First Tier Tribunal. He has also represented an individual in one of the first UK extradition cases to be determined by the Court of Justice of the European Union. He represents UK and foreign government departments, requesting judicial authorities and individuals. He acts for interested parties at inquests, often concerning deaths in custody, and advises on unlawful detention, prison law and national security.


  • Peter Duffy Human Rights Scholarship, Lincoln’s Inn, 2009
  • Sir Thomas More Bursary, Lincoln’s Inn, 2004
  • Lord Haldane Scholarship, Lincoln’s Inn, 2003
  • Hardwicke Scholarship, Lincoln’s Inn, 2003
  • Choral Scholarship, St Peter’s College, Oxford 1997


Chambers and Partners 2021 – Band 3
“An excellent advocate who is always thoroughly prepared.”  “He goes the extra mile and argues his points very well.”
Recent work: Successfully acted for an applicant in an appeal against extradition to the Netherlands to face charges of armed robbery. The appeal concerned issues of assault while in custody and subsequent PTSD.

Chambers & Partners 2020: Extradition- Band 3
Respected practitioner who is highlighted for his experience of handling leading prison conditions cases and difficult extradition matters. He represents foreign states, judicial authorities and individuals in extradition proceedings. Seifert is additionally praised for his complementary strength in immigration law.
Strengths: “He fights tirelessly and is extremely knowledgeable about extradition.”

Chambers & Partners 2019: Extradition- Band 3
“Extremely passionate and comes across very well in court; he presents in a very succinct way.”
“He is a pleasure to work with as he’s very helpful and always on top of the law.”

Chambers & Partners 2018: Extradition- Up and coming
“Respected practitioner who is highlighted for his experience of handling leading prison conditions cases and difficult extradition matters. Interviewees note that he is “quick to take things up” and “very strong with clients.”
Strengths: “Dedicated and enthusiastic.” “He had a very complex case with a very demanding client and the facts he had to work with weren’t great, but he was able to make the best out of what he had.”

Legal 500 2020- Level 2- Leading Junior
“He is unafraid to explore novel arguments in extradition cases”

Legal 500 2019- Level 2- Leading Junior
“Hardworking, affable and conscientious”

Legal 500 2017- Level 3- Leading Junior
“Represents requested persons in High Court cases”


  • Crown Prosecution Service Advocate Panel – General Crime – Grade 2
  • Crown Prosecution Service Advocate Panel – Extradition – Grade 4


  • GDL and BVC, BPP
  • BA (Hons) Modern Languages, University of Oxford, St Peter’s College
  • President of the Oxford Union (1999)

Professional Memberships

  • Elected member of the Bar Council: 2017-2019
  • Young Barristers’ Committee of the Bar Council: 2015-2019
  • Defence Extradition Lawyers’ Forum
  • Extradition Lawyers’ Association
  • Criminal Bar Association
  • South Eastern Circuit
  • Administrative Law Bar Association


French and Italian

Attorney General Panel

Appointed to B panel


Zabolotnyi v Mateszalka District Court, Hungary UKSC 2019/0210

On 23 February 2021 the Supreme Court will consider the first ever extradition appeal concerning prison conditions in a requesting state. It will deal with the viability of assurances which purport to guarantee compliance with Article 3 of the European Convention on Human Rights. It concerns the following question of public importance:

Read more

Taylor & Anor v The Prosecutor General’s Office of Florence [2019] EWHC 2938 (Admin)

The two requested persons appealed to the High Court against the decision to order their extradition to Italy. The case concerned the application of section 20 of the Extradition Act 2003 where the requested persons’ conviction in Italy became final following a hearing at the Court of Cassation (the highest court in Italy), at which they were unexpectedly not represented because their Italian lawyers attended a strike.

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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.

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XY v Public Prosecutor’s Office, Oost Nederland [2019] EWHC 624 (Admin)

The Court allowed an appeal against extradition in relation to a UK citizen whose surrender was sought by a court in the Netherlands for an offence of armed robbery for which he had already served a sentence which was increased on an appeal.

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Konecny v District Court in Brno Venkov (Czech Republic) UKSC 2017/0200

The Supreme Court has given judgment in the case of Konecny v District Court in Brno Venkov, Czech Republic UKSC 2017/0200.

The appeal considered whether or not an individual can properly be described as an accused person when he had been convicted but the conviction is not final because he has an unequivocal right to a retrial.

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Attila Imre v the District Court in Szolnok (Hungary) [2018] EWHC 218 (Admin), [2018] All ER (D) 79 (Feb)

Appearing as sole counsel against Mark Summers QC, Benjamin acted on behalf of the judicial authority in Hungary, successfully resisting an appeal against the order of extradition of a Hungarian national, Attila Imre.

Read more

Grecu & Bagarea [2017] 4 WLR 139, [2017] EWHC 1427 (Admin)

Landmark decision on Romanian prison conditions. Benjamin represented the first Appellant, led by Jonathan Hall QC. The Court found that, following the judgment of the Grand Chamber of the European Court of Human Rights in the case of Muršić v Croatia, there is a strong presumption of a violation of Article 3 of the European Convention on Human Rights where the personal space available to a detainee falls below 3m² in multi-occupancy accommodation. Such a presumption can only be rebutted when the reductions in the required minimum personal space are accompanied by various cumulative mitigating factors.

Raimundo Felix v Comarca de Lisboa, Portugal [2016] EWHC 3518 (Admin)

In a technical case with an appeal raised under Section 2 of the Extradition Act, as well as under Article 8, Benjamin successfully acted for a Portuguese national whose extradition was sort for offences concerning an allegation of forging identity documents.

Zagrean, Sunca and Chihaia v Romanian Judicial Authorities [2016] EWHC 2786 (Admin)

Led by Ben Emmerson QC, Benjamin represented Mr Chihaia. The court considered an acceptance, by the Romanian judicial authorities, that they had not complied with a general assurance issued in February 2015 that there would be a minimum space requirement for prisoners extradited from the UK. The assurance was reaffirmed and therefore was still reliable. Furthermore the court reconsidered Section 20 of the Extradition Act in light of the decision of the Court of Justice of the EU in the case of C-108/16 PPU, Openbaar Ministerie v. Dworzecki.

Marku & Murphy v Greek judicial authorities [2016] EWHC 1801 (Admin)

Led by Edward Fitzgerald QC, Benjamin represented Mr Murphy. The Divisional Court found that no one could be extradited to two Greek prisons (Napflion and Korydallos), unless and until there was evidence of significant improvement due to clear breaches of Article 3 of the European Convention on Human Rights.

Puceviciene, Conrath and Savov v three judicial authorities [2016] 1 WLR 4937; [2016] EWHC 1862 (Admin)

Representing the first appellant Benjamin was led by David Perry QC before a Divisional Court including Lord Thomas LCJ. It is the leading case on Section 12A of the Extradition Act 2003. Requesting judicial authorities must have made sufficient progress in a prosecution against an accused individual before that person can be extradited from the UK under a European Arrest Warrant. Decisions to charge and to try must have been made, except where the sole reason for the failure to make those decisions is the absence of the individual from the jurisdiction. The Court also considered mutual legal assistance. If the judicial authority states that it cannot charge or make a decision to try the individual because she is absent from the jurisdiction, then there should be no further questions and the issue of mutual legal assistance is irrelevant to the bar under Section 12A.

Spain v Warne [2015] EWHC 981 (Admin)

A successful appeal against discharge of a European Arrest Warrant issued in order to prosecute a British citizen for conspiracy to transport a large amount of cannabis into Spain in 2007. The Divisional Court found that the judge at first instance erred in finding that extradition would be oppressive. The matter was remitted to Westminster Magistrates’ Court and, after a further appeal, the appellant was extradited to Spain.’

R. v Lenton (Ryan) [2015] EWCA Crim 1812

A sentence of 10 years was reduced to one of seven-and-a-half years’ imprisonment in the case of an individual who had pleaded guilty to robbery after taking part in a night-time attack on a homeowner which involved significant violence.

France v Charbit [2015] 1 W.L.R. 2359

The European Arrest Warrant did not comply with Section 2 of the Extradition Act 2003 and the Court lacked jurisdiction to deal with it. The information in the annex did not form part of the warrant.

TGC Inquest & Inquiries Newsletter Vol III. July 2022

6th July 2022

Welcome to the third edition of the TGC Inquests and Inquiries newsletter, a twice-yearly publication, containing articles on recent key legal developments in these fields, as well as a selection of recent noteworthy cases in which Members of Chambers have been involved.

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A Practical Guide to Extradition Law Post-Brexit

9th September 2021

Published on 6 September 2021 by the TGC Extradition Team.

Supreme Court judgment

30th April 2021

The Supreme Court has today given judgment in the case of Zabolotnyi v Mateszalka District Court, Hungary. In an appeal concerning the conditions of Hungarian prisons, the Court was asked to decide on the approach to be taken in assessing and relying on assurances concerning the prison conditions given by the Hungarian authorities.

Read more

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Benjamin Seifert secures permission to appeal to the Supreme Court in landmark extradition case on prison conditions

12th March 2020

On 12 March 2020 Lord Hodge, Lord Sales and Lord Hamblen granted permission to appeal in a case which is the first extradition appeal concerning prison conditions to be heard by the Supreme Court. It will deal with the viability of assurances which purport to guarantee compliance with Article 3 of the European Convention on Human Rights. It concerns the following question of public importance:

“Where a Court is obliged to assess an assurance given to the United Kingdom relevant to extradition, is it is correct that the Court should exercise very considerable caution before admitting evidence which does not relate to an alleged previous breach of an assurance to the United Kingdom, but rather to an alleged breach of assurance to another EU member state? If yes, is it a correct approach that the Court should satisfy itself that such evidence is manifestly credible, directly relevant to the issue to be decided and of real importance for the decision in question?”.

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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

Benjamin Seifert appears in the Supreme Court

6th December 2018

Benjamin Seifert is appearing in the Supreme Court in Konecny v District Court in Brno Venkov, Czech Republic UKSC 2017/0200. It is an important extradition case which will determine whether or not an individual who is convicted of a criminal offence but is not a fugitive, or deliberately absent from his trial can properly be described as “accused” for the purposes of the Extradition Act 2003 in full consideration of the provisions of Council Framework Decision of 13 June 2002 (2002/584/JHA).

Privacy Notice

Thank you for choosing to instruct me in your case. I will need to collect and hold your personal information in order to represent you. I will take all possible steps to protect your personal information. I am determined to do nothing that would 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.

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

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I transfer personal data to the following third countries or international organisations using the identified safeguards because I sometimes am required to communicate with lawyers, academics and family members of my clients in other countries inside the EU and also other countries. However I will always inform you of which countries they are.

I am satisfied that such transferred data is fully protected and safeguarded as required by the General Data Protection Regulation.

I retain your personal data while you remain a client unless you ask me to delete it. My Retention and Disposal Policy (copy available on request) details how long I hold data for and how I dispose of it when it no longer needs to be held. I will delete or anonymise your information at your request unless:

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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 what I use it for, you can ask for a copy of the personal information I hold about you, you can ask us to correct any inaccuracies with the personal data I hold, you can ask us to stop sending you direct mail, or emails, or in some circumstances ask us 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 http://ico.org.uk/for_the_public/personal_information and this is the organisation that you can complain to if you are unhappy with how I dealt with you.

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