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The Spanish Grand Prix is a traditionally a point where Formula 1 teams introduce a mass of new parts, as it marks the end of the early-season whirlwind of consecutive flyaway races.
Sure enough nearly every team has aerodynamic, mechanical or power unit updates for Barcelona, but this time many of the rumoured big specification changes have been held back - either due to crash test failures or a desire to do more evaluation at the upcoming post-race test.
Nevertheless, there are still plenty of interesting developments to analyse following F1's first major upgrade push of 2015.
