Seen your post, car went into garage on Friday was able to drive there and the error message didn't appear again. They ran diagnostics and no faults showed. I had to go to another dealership to get the tailgate switch as thought would do that and would hopefully make sure problem didn't reoccur, when going to leave the shop the same error message appeared, however this time the display lights do come on and no error messages appear. Getting towed back to the garage tomorrow so they can hopefully get it sorted this time. Totally at a loss as to what could be as this time will still let me use the key to open and close the car whereas first time round had to use the manual key in the fob.