The battle between the ingenuity of teams and Formula 1’s rule-makers is never-ending, particularly when it comes to one very significant aspect of car design. It’s an area where the combination of the potentially significant performance benefits and the difficulty of policing collide to create enormous opportunity for teams. You can thank the laws of physics for that, because they make keeping this under control a complicated task. The latest flashpoint in the never-ending war of push-and-pull between the FIA and the teams is a technical directive that kicks in at the start of the Singapore Grand Prix weekend. And it could have a noticeable effect on how the second half of the season plays out. That’s because it’s all about flexible bodywork. And if you’ve followed F1 for a while, you’ll be very familiar with the controversies that regularly flare up around flexi-wings. But if you’re someone who is thinking ‘just have a black-and-white rule with zero-tolerance policing’, there are