Re: Ragazzon Vibration
Took it to the Exhaust fitters who identified that it was the heatshields around the catalytic converter that were vibrating. Apparently, the top and bottom shields are joined together. Normally, they would offer to take one off, the top or the bottom but were loath to remove both.
So, it looks like i'm going to have to live with the racket until I need a new cat. Thanks for all your advice anyway - at least I've quietened down the referred vibration in the engine compartment!