Update ..... I almost don't want to write this for fear of jinxing things :D :D :D .
But my battery drain problem seems to have been sorted.
After an endless process of elimination the culprit appears to have been a faulty driver side window/mirror switch panel. There was no code fault thrown up by ...

Thanks for the replies. Very much appreciated
Investigations continue tomorrow!
Ian

Hi ...still no joy!
Replaced the relay. Still the same symptoms.
Any ideas?
Ian

Hello,
Car is a 2007 X5 SE 3.0d 235bhp.
I have a weird fault and would be grateful for any thoughts from people much smarter than me.
Quick description: I am trying to narrow down a battery drain.
It appears that the car not going fully to sleep and powering down completely as it should.
The key ...