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you will need to remove the rear seat backs and the whole rear door cards to get to the rear parcel shelf and side blinds.

There is a good article on removing the rear door cards on THIS Audipages article, just take it steady or you will snap clips off (may even be worth gathering some new door clips prior to doing the job as they are literally pence for a pack on ebay.

Rear Blind mechanism is attached below the rear parcel shelf, just be careful as they are shall we say a bit fragile and subject to sticking if you are not careful when you reassemble everything if you have warped or twisted any part. you also need the curved wooden pieces to be in place under the shelf so that they help keep it even when it slides back into place. when I upgraded mine to alcantara the rear blind wasnt playing ball as it had these pieces missing and when i removed them from the old blind and glued them into place on the new one, it seemed to work correctly straight away.

Rear seat removal - disconnect the battery, otherwise the airbag module will record a fault when you disconnect the seats

The base comes out first. There are two crosshead screws - One at each side, directly under the squab on the vertical carpet behind an inch square carpet cover, one at each side. Remove these screws and lift the front of the squab up and move it forward. Disconnect any wires and remove from car.

This reveals the rear backrest bolts at the bottom, and the isofix in your case. The Isofix is 2 x 13mm bolts in each side, iirc, and once this is removed, you can remove the 2 crossheads under the isofix that actually holds the backrest in place.

Before the backrest comes out though, the facelift cars have 2 extra 10mm bolts at the top of the armrest, under the center head rest. Pop the center head rest up, and the armrest down. There is a leather cover which is held by two poppers at the bottom. They pop out, and the leather cover moves up to reveal the two bolts. Remove them.

Then, preferably with a helper, the whole backrest has to go up vertically by a couple of inches before it lifts forward and off its hooked brackets. You can safely pop it on the floor where the base was whilst you disconnect the airbags and fathom out the center seatbelt.

Once done, the backrest will come out of the car easily.