You have got to be frikin kidding!!!!! You've either not been paying attention or your burying your head in the sand?
Prosecutions started in 2000, Alan Bates (you might of heard of him?) was accused of 2 instances of false accounting in 2000 and was dismissed by POL in 2003!
As I have said countless times in this thread I have been aware of the wrongdoings since 2003!
The JFSA was in full swing by 2009 and there had been numerous articles about the scandal before that date, the first big expose by Computer Weekly was published in 2009.
Your suggestion that nothing was known before 2010 is an insult to the nearly 700 sub-postmasters prosecute during that time! Their lives were ruined long before the tories came to power.