Formula 1 returns this weekend at the Spanish GP and the first European race of the season is set to see the teams bring a host of updates to their cars. While some teams, notably Ferrari, have already bolted on upgrades, it is in Barcelona where the development race truly kicks into gear. "It's the first time the cars have been back to the factory since the start of the season. Some bits may need grafting on - it's not a case of just taking something off a shelf and bolting it on. This will have been the first real opportunity they've had to strip the car down," former McLaren mechanic Marc Priestley explains on this week's F1 Report. Here, Sky F1 examine a few things to look out...
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