UK Car Repair Questions? Ask a Mechanic for Answers ASAP
Its possible the little plastic side trims are at fault. They have plastic gears in them and they wear,if it doesn't move properly if its the gear that has stripped the screw inside the flap will be turning but the fin won't move. If nothing is moving or making any sound it could be something else.
There is a common problem with a wiring loom in the boot which gets damaged. Might be worth having a look at it if the boot is open and its accessable
do you still need help?
Bear in mind that the site takes a deposit from you at the beginning and this is held by the site until you rate my answer at which point the cash is split between the site and the expert. so if my answers have been helpful please rate my answer.