The reversing camera 'disappeared' again today I suppose a month without problems was too good to be true.....

A wire that had come adrift apparently - now sorted.

Check for a tracking unit even if you did not have it installed some dealers install them in dealer mode
if the unit is struggling for a signal or is fitted for speed of installation by installer in the front of the vehicle
I have seen problems of interference

It’s sorted now - but you were spot on - the interference was caused by an aftermarket tracker fitted prior to the vehicle being sold by Rybrook as an approved used Land Rover. It took a couple of months and a Land Rover employed master tech to get it sorted.