The saga of the Ferrari ERS system has been both a fascinating case study into how the FIA deals with suspicions stirred up by rival Formula 1 teams, and also an intriguing insight into just how much pressure the Maranello outfit is piling on Mercedes this year.
The two teams may now be unlikely pals and fully aligned when it comes to politics, but with matters on track, there's still a bitter rivalry.
After three years of dominance, and what ultimately turned into a comfortable title win last year, Mercedes is under the cosh. Lewis Hamilton currently enjoys a 14-point lead in the world championship, but had Sebastian Vettel not been punted off by Max Verstappen in China, the German would now be in a stronger position.