Hi, I have just bought a 56 plate 1.4 about 4 weeks ago and have only recently noticed the cold start tappet noise (I had the window down when starting and noticed the noise, which I hadn't heard before), but as you say the noise goes away when the engine has warmed up. Do you know if this is an expensive thing to rectify and /or does it cause any long term harm if not rectified? Does it also need to be a Fiat dealer who does the work?