is it not 3yrs or 60k which ever comes first and the warranty has ended. So if have reached the 3yr, then i wouldn't worry about removing the BMC as out of warranty anyway.
Yes you are right it is 3 years/60,000k miles. No probs if your car goes over this.
Mind you someone at Humphris Oxford told me it was 30,000 or 36,000 miles!!! I looked into it and that was wrong. I was worried for a day or so as my car is knocking on into that territory!