Have finally solved a vibration problem which had not affected the steering. The car had done 21,000 miles...95% of which was on the motorway. Landrover inspection informed me that the tyres were deformed and needed replacing, no reasons given. A Landrover friend suggested that I have the geometry checked. This turned out to be very out of line and apparently the car would have been "crabing". The technician's opinion was that the car had been like this from new. I informed Landrover who didn't want to know. Subsequently replaced the rear Goodyear Wranglers with Michelin Diamaris. Problem solved!!!!! E-mailed Goodyear several weeks ago.....no reply! Hope this helps anyone with a vibration problem.