It can be changed. Push the SOS button and ask the Assist Service Center to make the change. Caveat - I think this should work for you in the UK, but I'm giving U.S. advice.
Present - '06 E90 330i sport; Past - '04 E46 ZHP, '00 E46 328i
www.bmwcca.org member #388003 - Use me as a referral & you could win a one day ///M Driving School!!