P38A Vibration noise at 1000revs

Just thought id post this incase it helps anyone out......... noticed that when the car started and the revs dropped to 1000 I would start to get a strange vibration type noise within the the cab...... anything over 1000 rev and all was fine

Anyhoo I checked underneath and the exhaust heat shield had dropped onto the exhaust (clip had come off,)
Refixed and the world is now a better place

I forgot to mention that it uses a push on clip onto a 6mm thread...... a couple of washers and a nut are more than up to the task of holding it back into place