I gave the car 2 decent shakedowns on road, no issue. Then yesterday, setting off for Donington Park, second gear sounds very noisy. So I skip second and use the other gears (Donnington doesn't need it anyway). But the problem gets worse, and the box is noisy even in neutral. Gets worse and I'm forced to retire.
Also annoyingly my lap timing system failed after 4 steady laps (best of 1min 32 up to that point), so had no idea how it went after that.
Another setback, potentially expensive and time consuming to fix