Does anyone know if the front and centre-rear headrests are removeable and if so, how?! I've got a A3 Sportback (56 reg) and they seem to be fairly permanent. On the front headrests, the cushion moves up/down on fixed rods attached to the seat (unlike my old Golf where the rods were attached to the cushion). In the rear, I can remove the side headrests ok but not the central one. Thanks.