Glock, I understand what you're getting at. No point calling the BMWM telephonist. Call the SCs of IA, QA, SA and AB, and explain your situation. Only they can tell you whether they can claim your BSRI at 23K. I bet you some will be blur, some will tell you no, and some will tell you yes. Go to the one that says yes. I have a feeling that IA and QA will say yes. QA has a brand new service centre off the LDP.
If all tell you no, call the After Sales Director in BMWM who signed the letter, and complain that the dealers are not practising what he's preaching.
Let us know the results - it would be interesting for us to know what's the rule during this transition from 25k to 20k interval.