Nope, Xbox360 games bought in the US will not work on an EU system.
CoD: Black Ops topped the sales charts for XBox360 and PS3 in November 2010 in the US and UK.
no
Yes. All you need to do is re-sync it to their Xbox360.
yes
About £400 to £500 in argos blackburn mall
No. Unless you have a UK to US power adaptor you can not use it.
yes you can, but you will have to use a UK proxy.
Yes!
id think so i know you cant use a cricket aircard on the xbox360 for xbox live
yes. however you will need an adapter for your plug and voltage.
ofcourse they do