There's an ignition switch terminal that I expect is still vacant on you disco, it was used when the option of the car phone was added when new.
I now use that terminal to power my mobile phone kit and dash cam, but then you can pick up on the ignition switch main wire where it enters the fuse box, but also beware a there are a few ignition switched circuits going through the MFU.
I have a ready posted a photo where the phone connection is.
Thank you,
That sounds like a good option. I found the pics you posted. Are they from a D2 or D1?
http://photobucket.com/gallery/http...lectrical/Discovery_II/DSC02697R-S13.jpg.html
Are we talking about the F13 /F12 sockets?