Car was in today at Peter Vardy. Warranty Manager thinks it is "stone chips". I said even if it was a chip, it should not "rust", plenty other stone chips on my car, much more obvious that have not bubbled. My third MINI and I have never seen this before.

They have taken pics that have been sent to MINI.

Will report when I find out. Might post on MINI2 and TotalMINI to see if anyone on there has similar experience.