§ Mr. Hancock
To ask the Secretary of State for the Home Department whether(a) membership of the International Court of Justice and (b) compliance with the Human Rights Act are criteria applied in determining with which countries the UK agrees extradition treaties are based; and if he will make a statement. 
§ Caroline Flint
Membership of the International Court of Justice (ICJ) is not, in itself, a factor that determines if the UK can agree an extradition treaty with another state. The European Convention on Human Rights (ECHR) was incorporated into the Human Rights Act 1998 and underpins all UK extradition legislation.
Any decision to order a fugitive's surrender is taken with full regard to the UK's international obligations.