My 55 2litre HDI has developed a noise in the engine conpartment. When I come off the throttle and go on to the throttle the engine, I think, is moving on its mounts and I can hear a knocking noise from the OS side of the engine conpartment. I suspect that the engine is moving on its mount more than it should do. Also on turning the engine off, it apears to rock on its mount and I can hear the same knocking noise. I suspect it is coming from an engine mount. Has anyone else come across this? Are the mounts known to wear easily and/or is this known about. I dont want the main dealer to charge me the earth to find something that is known of (suspicious or WHAT) It has done 45,000 miles.