Formula 1: Behind-the-scenes at the Bahrain pre-season test

BBC Sport's Jennie Gow goes behind-the-scenes at the second Formula 1 pre-season test in Bahrain.

Red Bull have continued to struggle with their Renault engines, but Mercedes and McLaren have put down some quick times.

The Australian Grand Prix, which starts the new season, takes places on 14-16 March.

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