Well, I got The Duchess valeted because I was driving over to the continent and taking some colleagues to a meeting when I got there. I'm hoping that the local carwash guys got a bit excited with the water.. but I suspect I might have something else going on!
After about 30m of driving, I braked quite hard for something and immediately the horn started and I had to hit it again to switch it off. Most odd! Then I turned the wipers on and the horn stayed on, the wipers wouldn't switch off and then the alarm decided to join in. The dashboard backlights also dimmed in time to the wipers, which was quite trippy.
So, I did what anyone else would do and turned the radio up so I could keep moving and didn't miss the ferry. I did a quick restart in a laybay which brought the wipers back under control but hilariously, a single sweep would beep the horn whenever the wipers moved through the park position. Then the alarm started again, it ran for 5-10 minutes at a time before shutting off for another 5 monutes or so. Luckily, nobody in Hull seems to notice cars being driven with their alarms going, so I was able to keep going without getting arrested. I stopped at a garage, switched everything off and filled up with fuel (because adding LPG and Petrol to faulty electrics is how I roll). The Duchess decided to behave perfectly after that and didn't miss a beat for the next three days (and still counting).
Judging by the bits that were affected, I'm wondering if I need to think about replacing the clock spring in the steering column, or whether I just chalk it up to the joys of damp Range Rovers and keep on trucking. The worrying option would be the fuse box - does anyone have an idea where I should look to make sure this isn't something that is likely to set an airbag off, or leave me stranded?