That was the same problem I had when trying to post the £5's you sent. I had to use a stock scan I already had. Scanners today have built in software to stop counterfieting. I have had mine refuse U.S., Japanese, Mexican, and British notes so far. Funny thing is that it is not ALL of those notes, just new, or high denomination notes, or at high resolutions.

The U.S., and Britian, (and some others) are VERY strict in the recording and displaying of bank note images on any medium (paper, film, digital, etc.).