I'm having the same problem. My horn worked intermittently and then has stopped all together. I took it to my local indy garage and they checked all fo the same things (relay, contacts/swith in the steering wheel etc) and couldn't find the cause. They think it may be something like a broken circuit or other electrical fault.
Unfortunately I think I'm going to have to take it to a dealer as the indy's diagnostic computer didn't pick anything up. I'd be very interested, like Mike, in hearing of anyone else who has had similar issues.
I need to get it sorted soon as it needs to work to get the annual MOT!
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