Ok. So random as hell. Took the ULF out and took it to a specialist. Very nice guy. He hooked up the diagnostics and said that the ULF is talking however when it is plugged in, there's no red light on the monitor to say it's recognised not does it go into pairing mode at all. We connected another ULF and after clearing a few faults it worked fine. I wonder what would cause the diagnostics to think it was operating ok but it not be operating ok in "the real world". He's going to try and fix it, otherwise I'm going to have to buy another one.


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2005 X5 4.4i Sport Sterling/Black