UK Car Repair: Panel removal from a astra, window handle, plastic cap

Question
I CAN'T OPEN THE REAR DOOR FROM THE OUTSIDE BUT IT WILL OPEN FROM THE
INSIDE. I'M TRYING TO REMOVE THE INTERNAL TRIM BUT THE WINDOW HANDLE
WON'T LET ME.  

Answer
IS THERE A PLASTIC CAP IN THE CENTRE OF THE HANDLE WHERE IT FITS TO THE DOOR? IF SO, PRY IT OFF AND YOU WILL SEE THE SCREW. IF NOT, YOU NEED TO PUSH IN ON THE COVER PIECE THAT GOES UP AGAINST THE PANEL, PUSH IT IN AND THERE IS A SECURING PIN OR CLIP WHICH HAS TO BE REMOVED.