Follow up from previous post which I can't find - when de-celerating from 70-50mph, headache inducing reverberation occured - subsequently found this happened in all gears and was related to engine speed supposedly. Anyway, upshot was have had both propshafts + joints replaced and it seems to have cured it - garage reckoned car is so long that shafts eventually get warped & so vibrate - no idea why engine speed was a factor, & as they were paying for it & it cured problem I'm not complaining, but just seems a bit wierd. thanks again for comments
