Long time with this Whine but................ Finally sorted it out (Hooray !!)

A pin from the Pinion ( as in Crown wheel and pinion) had worked loose and was cirvulating with the rotation of the propshaft generally knackering the whole diff ! Lots of 'silver metal' in the oil from the back axle when dropped.

Solution - Replacement Diff from a breaker £80. Fitting £100. Result - All quiet on the the Western Front . I can hear the radion again !!

Bliss !!

Ian K
PS I stll have a whine from the passenger seat (but she now has her own car- so that's cured)