From blog:

It may be of interest that Halligen was initially represented in the extradition proceedings by Mark Summers of the barristers’ chamber Matrix - where he was a colleague of Cherie Blair, wife of former Prime Minister Tony Blair, and Founder of Matrix Chambers. Summers was the lawyer of choice for politically sensitive cases and complex cross-border and jurisdictional issues.

His trials also include cases of human trafficking and child abduction. Several of the people Summers has represented have died in mysterious circumstances.