Basically, Pirelli has put Mercedes up shit creek, stolen their paddle, but a hole in the boat, and continue to pour shit down on top of them!
I disagree.
All of the teams and personnel are fully aware of the rules and if they aren't then that's their problem.
I refuse to accept that Ross Brawn of all people would make a mistake like this.
Besides which, further reports now make it clear that the teams were written to in April 2012 making it clear in season tyre testing was prohibited unless agreed to by all teams.
http://www.autosport.com/news/report.php/id/107726
Mercedes only have themselves to blame.