I have some interesting feedback.
The BMW dealer (in particular the manager responsible for the dealership fleet) response:
* the 25K km is normal for RF's,
* recommended Bridgestone RF's according to his experience.
* In his private capacity not shy to suggest the option of changing to normal radial tyres with the spare kit. As such suggested Bridgestone or Michelin.
* Rotation of tyres should be done although the owner's manual states that the manufacturer does not recommend rotation.
* One should do a thorough inspection of the tyres on a regular base
* Changing to non-RF's does not affect maintenance plan/guarantee.
Tiger Wheel & Tyre franchise observation/recommendation:
* Rotation of tyres is a must (front to back and vica verca)
AND left/right 
This is recommended due to the negative camber of the tyres (which explains the shoulders on the inside being worn badly.
*Also suggested the option of normal radial tyres with the prospect of more mileage.
I have opted for the Michelin Primacy HP and spare tyre option.
Interestingly there is a long waiting list for the X1 spare tyre kit on back order.