The "screw up" made by you Tim, is more "accidental" than scanning in a photo-card and cloning this onto that, and printing it off and.....goodness knows what else!
As you say, you were just trying to get one over BR▸ by extending the date. From what I have read on this thread, the passenger in question set out and spent a long time preparing a large fraud! It is therefore more serious....
Perhaps, but it didn't take a huge punishment to cause me to mend my ways. A bit of embarassment at the booking office was enough to scare me off trying anything like that again.