McLaren racing director Eric Boullier has described the cause of a lack of running earlier in pre-season testing as "a stupid bolt" that failed.Having missed out on a chunk of track time when Fernando Alonso crashed on Monday morning – when a loose wheel nut was to blame as the...

Toro Rosso used guesswork to design the installation of its 2015-spec Ferrari Formula 1 engine while waiting for confirmation of the deal, says technical director James Key.The team did not get confirmation that it would be swapping supplier from Renault until early November and that made preparations difficult considering the...