So having left my car in at Harwoods Basingstoke to have a couple of warranty issues sorted, I was intrigued to find that despite me not really expecting a fix, the technician had agreed that mine was noisy and applied a TSB which he reckoned would cure it, even though it was outside the expected VIN range. They claim that has fixed it and from what I can tell thus far, it has... 
The culprit? As mentioned as one of the theories in the sewing machine thread, an earthing strap (causing noise transfer from the high pressure fuel pump)!... I took some pics of the TSB which was included in my document pack (click the images to view the bigger versions on my Google Drive) which will hopefully allow those of you suffering a similar affliction to point your dealership in that direction, even if your VIN is outside the TSB range... Clearly it could be something else, but it's a cheap initial fix for them to try! NB the XE is an X760 (260 is XF, 761 FPace).
Note also that there are several variants of the XE affected, not just the XE S...




The culprit? As mentioned as one of the theories in the sewing machine thread, an earthing strap (causing noise transfer from the high pressure fuel pump)!... I took some pics of the TSB which was included in my document pack (click the images to view the bigger versions on my Google Drive) which will hopefully allow those of you suffering a similar affliction to point your dealership in that direction, even if your VIN is outside the TSB range... Clearly it could be something else, but it's a cheap initial fix for them to try! NB the XE is an X760 (260 is XF, 761 FPace).
Note also that there are several variants of the XE affected, not just the XE S...



