Hi All, My horn was intermittent (!)...they have changed the switches both sides as apparently they've had a lot of bikes do this (no joke when you drive into London every day) and when they did it they pointed out the sump cover is rusty (I've only had the bike since end of September)...apparently the metal on some of the bikes reacts with the salt on the road...so they're replacing that....might be worth having a look underneath yours...