I've tried six times so far to change my Range Rover's clock from BST (British Summer Time) to GMT, i.e. set it one hour back. Each time it appears to work fine (the analogue clock hands wind back an hour and the digital clock updates too). Then when I look again some time later ranging from half an hour to one day, it's gone back to summer time. Is this a problem that's unique to my car? Thanks in advance to anyone who has any ideas how I can convince the car that it's not summer any more!