Demaestro - 8:36 pm on Oct 20, 2010 (gmt 0)
I am really surprised that they, 1) had the nerve to ask you and 2) had the drive to follow through.
If you are in the UK I am not sure the FBI would be interested unless you could show that the request came from within the US border.
You may have to start with the local (to your server) authorities, and then just make sure it gets elevated to the proper place.
You should 100% for sure contact the authorities. You defiantly shouldn't poke the bear though. This isn't like a 419 Eater where they have no recourse.
This is happening to you because they want money. What you don't want is to give them motivation outside that to continue to attack you. If they are doing it for money they will stop when they are sure they won't get any. If they are doing it to get back at you then who knows when/if they will stop.