There is an option for 'Sync Odometer' with nanocom.
However, I can't make it work :-(
Plus, I wasnt very impressed with the reply I got from their tech guy over it - I don't want to be told "The source code has some limitations I think - I will check and get back to you" - and then not doing so. I didn't buy a 'beta' product (or at least, it wasnt sold as such!)
I changed the dash, so my new dash has a lower mileage than the correct one that the BCU still remembers. I can use nanocom to stop it flashing, but I can't seem to get Sync odometer to set the dash to the correct mileage from the BCU, so it now reads 40k too low (but at least it doesnt annoy me by flashing!)
David