The modern MINI Cooper has a factory installed Tire Pressure Monitoring System.  The TPMS systems include a factory set standard for pressure that from time to time may simply need to be reset.

The initialization process adopts the set inflation tire pressures as reference values for the detection of a flat tire. Initialization is started by confirming the inflation pressures.

Do not initialize the system when driving with snow chains.

1.  "Vehicle Info"
2.  "Vehicle status"
3.  "Perform reset"
4.  Start the engine - do not drive away.
5.  Start the initialization with "Perform reset".
6.  Drive away.

The initialization is completed while driving, which can be interrupted at any time. The initialization automatically continues when driving resumes.

From page 98 of the online 2014 F56 Mini Owners Manual