Extradition has been defined to be: "... the formal name given to the process whereby one sovereign state (the requesting state) asks another soveregin state (the requested state) to return to the requesting state someone present in the requested state (the defendant) in order that he may be brought to trial on criminal charges in the requesting state. The process also applies where the defendant has escaped from lawful custody following conviction in the requesting state - or is otherwise unlawfully at large - and is found in the requested state." [R. v. Evans ex p Pinochet Ugarte, 28 October 1998, CO/4074/98, p. 3, per Lord Bingham of Cornhill CJ].