Many thanks for your response. I am happy to wait for an answer . Thanks for your help and good luck.
Thanks very much. It was all of a sudden, I just got in the car one morning last week and noticed the Satnav was not working, the BMW sign came up and then the screen went red,then the BMW sign comes up, there is a very quiet click and then the screen goes red in a continuous cycle. When I take the fob out the BMW sign stays on for a fair while. I have tried disconnecting the battery again but it made no difference.
Any help gratefully appreciated.
Very many thanks for your really useful info - at least I have some idea now!
Having put off getting this sorted because of the inevitable bill, it has just this minute all sprung into life! Amazing.No apparent reason but I am keeping my fingers crossed it continues to work.
Thanks again for the help