Formula One teams were warned in 2012 that private in-testing is not allowed under the sport's regulations, a leaked letter has revealed. Mercedes and Pirelli are in trouble with the FIA after it emerged during this weekend's Monaco GP that they conducted a three-day test with a 2013-spec car after the Spanish GP earlier this month. Red Bull and Ferrari both lodged an appeal to the Monte Carlo stewards and the matter will now be put before the International Tribunal. Although the Brackely-based squad maintain they didn't do anything wrong, Autosport reports that a letter sent to teams last year by the FOrmula One Teams' Association states clearly that in-season tyre testing for Pirelli by...
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