Formula One teams were warned in 2012 that private in-testing is not allowed under the sport's regulations, a leaked letter has revealed.
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"Pirelli is entitled under the terms of their agreement with the FIA to offer teams 1000km of tyre testing, subject to each team being treated equally," the letter said.
"However there are no provisions within the Sporting Regulations for such testing to take place in-season.
"[FOTA has] spoken with Charlie [Whiting] to confirm the process going forward, and there are two options: 1. ALL teams want to take up Pirelli's offer and this is communicated to the FIA who will amend the Sporting Regulations; or 2. The test takes place out of season (and then the testing agreement comes into play)."
Teams were warned against testing | Planet F1 | Formula One News