Discovery 2 Horn problems

During the night, my horn has sounded 5 times. It's not the alarm going off- at one stage I left the doors unlocked and it still went off. Initially it went off for about 5 seconds then at about 3:00am it came on and stayed on until I started the engine. Then about 30 minutes later it went off again and wouldnt top until I took the fuse out.

To prevent my neighbours having another interupted night, does anyone have any ideas what might be causing it?

It had been raining yesterday but the Disco had been standing locked for hours and there was no rain from about 6:00pm yesterday evening.

Thanks

My TD5 has done this, I looked at the buttons on the S/wheel, you may find that one of them is still slightly pressed in, not fully out. Any vibration, like a passing car then sets it off. Worth checking.

Thanks for that, I'll check the switches.