I have replaced the cabin filter but  I  can't get the fibre cover to stay in place in the footwell where the hot air vent is situated near to the cabin filter cover. That tongue drops down and is visible from the passenger seat and looks tacky. It seems as though it is wedged in position and only luck keeps it in place with no fixings visible.

I've had the same problem. Annoyed me so much I threw it in the bin!

What a design!! On my sister-in-laws Fabia that cover fell down over my feet. It is these finer design faults which annoy owners

Same here. What a PITA;