During this time, the Tyrrell team had undergone a difficult period due to the fuel irregularities involving the re-filling of water tanks and the insertion of lead shot balls in the fuel tanks, in order to meet the minimum weight rules. In an unprecedented move that has not been repeated since, the FIA decided to ban the Tyrrell team from every future Grand Prix that season and strip the small English team of all its championship points on the grounds of cheating; team owner/operator Ken Tyrrell lost most of his sponsors between the Dallas and British Grands Prix.