bigwinn said:
Do you know what... I think I've solved mine (or it solved itself)!
Before my trip to Scotland I decided to get hold of another jubilee clip for the sound generator pipe that has been missing one since I bought the car. I fitted this, clamped it up tight and not heard the sound come back during the entire trip or since.
Obviously I'm not certain that this was the culprit but I changed nothing else and the sound went away. I'll keep listening out to see if it comes back.
