Oliver I have a series 1 412 and have had the door trims off many times. Presuming your later car is the same as mine you simply remove the arm rest and the internal door handle and with a suitable flat bladed tool you work your way from the bottom of the card pulling out the hidden clips as you go. With all the clips released you pull down on the card pulling it away from the trim at the top of the door, a few jiggles and it should slip out.
Hope that helps
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