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The little plastic flap catch insert was broken when I bought the car and the spring hinge wasn't working either, so onto Ebay and got a new hinge/spring and catch.
Fitted the catch in the rain...

I've currently got an 850 without and a V70 T5 with Nivomats, and previously had an 850 T5 with Nivomats, and as a previous poster has said the Nivomats do tend to cause the rear end to skip over...