So, it is the return of the Performance box.
0-60mph runs on a flat surface and done each way. Surface was dry, but with some mud in parts. Tyres were normal road tyres (not semi slicks), the car had it's full interior minus the spare (aerosol onboard!) and a full tank of fuel. Runs were done in sport mode with the traction control off.
0-60mph in 5.1 second both ways
Here is a pic of the performance box screen.