The Supreme Court has dismissed WikiLeaks founder Julian Assange's appeal against extradition to Sweden, with Blackstone Chambers and Matrix Chambers taking the key legal roles.

Assange (pictured) has been the subject of a request for extradition by the Swedish Prosecuting Authority to investigate alleged offences of sexual molestation and rape.

A prosecutor in Sweden issued a European Arrest Warrant (EAW) in December 2010, with Assange challenging the validity of the warrant on the basis that the public prosecutor who issued it was not a 'judicial authority'.

However, The Supreme Court today dismissed the appeal by a majority of five to two, with Lady Hale and Lord Mance dissenting, holding that an EAW issued by a public prosecutor is valid in the context.

Blackstone's Dinah Rose QC acted for Assange, instructed by City firm Birnberg Peirce & Partners, while Matrix's Clare Montgomery QC was instructed by the Crown Prosecution Service to advise the Swedish Prosecution Authority.

The case was heard in the Supreme Court in February this year.

Assange is understood to have been given 14 days to consider the judgment before he must decide whether to appeal the decision again in the European Court of Human Rights.