English High Court Upholds Extradition Order in Omisora Case, Clarifies Standards for Warrants and Forum Bar

Citation: [2023] EWHC 3039 (Admin)
Judgment on


In the case of Adeyinka Omisora v Central Investigative Court No 5 Madrid [2023] EWHC 3039 (Admin), the English High Court addressed several crucial extradition law principles under the Extradition Act 2003 (“EA 2003”). The appellant challenged the extradition order on grounds pertaining to the adequacy of the particulars provided in the Spanish arrest warrant, sentencing particulars, and the applicability of the forum bar. The Court’s decision illuminates the standards applied when scrutinizing extradition requests and the balancing act inherent in cross-border criminal justice.

Key Facts

Adeyinka Omisora, the appellant, is accused of participation in a large-scale cyber fraud conspiracy and sought by the Spanish Judicial Authority. The extradition warrant alleged his involvement started around January 2015, with specific instances of communication noted in November 2015. The warrant contained ambiguities, including references to an undefined “SPONK” and unclear involvement in a €359,000 transaction. The appellant argued against extradition on various grounds, including the particularity of the warrant’s details, sentence particulars, and the interests of justice concerning the forum bar.

Particularity of the Warrant

Under s.2(4)(c) of EA 2003, a warrant must detail the circumstances of the alleged offense, including the conduct, time, and location, thus enabling the accused to understand the accusation’s substance. The Court emphasized that warrants are subject to a standard of “substantial compliance” rather than exacting detail; mutual trust within the extradition framework is essential. The Court considered whether the warrant’s inadequacy was a “wholesale failure” or whether the deficiencies could be rectified through further information. Additional information was subsequently provided, clarifying the allegations and the appellant’s alleged role in the conspiracy.

Particularity of Sentence

Pursuant to s.2(4)(d) of EA 2003, a warrant must specify the maximum sentence for the offense. The Court resolved apparent discrepancies in the sentencing information, confirming the maximum sentence stated in one part of the warrant was considered unequivocal and did not require additional explanation of how it was reached.

Forum Bar

Section 19B of EA 2003 introduces a “forum bar” to extradition, meaning extradition may be barred if substantial activities occurred in the UK and if the interests of justice favor a UK trial. The Court analyzed specific factors, including the location of harm or loss, interests of victims, prosecutorial belief regarding jurisdictional appropriateness, evidence location, potential for delay, desirability of centralized prosecution, and the suspect’s UK connections. The judge’s evaluative decision on each factor was critically assessed.


The High Court upheld the original extradition order on all grounds. The Court found that, despite initial deficiencies in the warrant’s details, the information met the substantive compliance requirement once supplemented. The Court concurred with the lower court’s findings regarding the maximum sentence and the forum bar application.


The High Court’s decision in Omisora reiterates the balance between detail and practicality in extradition proceedings under the EA 2003. While certain particulars must be provided in an arrest warrant, absolute comprehensiveness is not demanded. Moreover, the Court stressed a collective approach towards mutual recognition and cooperation in combating transnational crime, highlighting the need for flexibility within frameworks of international judicial collaboration. The Court’s rigorous analysis demonstrates the care taken to safeguard individual rights whilst ensuring the effective administration of justice across jurisdictions.

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