Rear Wiper Arm removal on 2010 Model, I took the kids to local safari park and stupidly drove through the monkey enclosure resulting in a rear wiper arm being stolen, all that's left is the small plastic piece which the arm clicks onto although this will have to come off as it has a snapped edge, I have got the plastic circle out and removed the bolt from underneath, do I need to remove anything from under the plastic trim inside the boot as tried pulling it off and not budging, I don't want to damage the motor