– Williams reserve Felipe Nasr described as "very difficult" his first experience of 2015's proposed tyre warmer ban, having dedicated his day of running at the post-race Bahrain test to development work for Pirelli. Next season, Formula 1 teams are set to compete without the assistance of heating devices, which has recently been questioned by sole supplier Pirelli amid doubts over its capability to design and produce a safe product. "Running a Formula 1 tyre when it hasn't been in a blanket was one of the most interesting things as it's very difficult to get them up to temperature, even in the Bahrain heat," Nasr explained as the test concluded. He added:...
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