I may have the solution when removing the trailer the turbo soleniod gets stuck and leaves the car in high ratio .This is going in to be replaced next week,error code poo45-19-pcm it also uses to much power in this state therefore other instuments may or may not work consistently.

Guess what !! the main stealer cant find anything wrong with the car, well on to customer services i supose

Well, well after 18000 miles and 18 months of driving it appears that all problems have been cured .There is a directive from Land Rover that the battery needs more power ,so if anybody out there is suffering from electrical faults including dodgy fuel sender units, Go get a new battery.