mmmmmmmm...OK......the reported technical any proved ability of the vehicles climbing mountains & the like is well known and suggested as in the best of the best, however the simple reliability appears as
waining and wanting 
a little for such a range of the very expensive 4x4 vehicles
We must also remember that
HM [Lizzie] has stood down from the Rover callout team of roadside Techo's as she is not up to repairing these vehicles as she did in WW11.......
Derek
