I have just booked up my E86 for the Saturday using the E85 code, like I did last year, and didn't have any issues on the day.
Having had David Frith (The BMWCCGB chairman) over to us at our local meeting last month, we were informed that there is due to be a BMW world record attempt over the weekend, and therefore all BMW's on the day will be invited to do the parade lap. I believe it's an attempt to get as many BMW's on track as possible to have a go at beating the record. I missed out last year due to the rain so this really is good news!
Mike.