Thanks to all and drahpla on this. Smart key obtained and getting programmed this week.
However, do have an issue whereby the power boot doesn't like closing. Will start but it's like a sensor is picking up an obstruction and it opens up again. No real pattern to it. Can go down an inch and back up, or can go 30% down then back up. Makes no difference if pressing the tailgate button briefly or longer. Same thing if using the button on the dash. It's probably closed properly 3 times out of 20 tries.
It opens fine from the dash button.
Is there a reset or calibration process for the power boot like for the windows or any ideas?
Thanks.