As I had some spare time this morning I decided to strip the back panel off the 2nd row seats, detached the seat control cable, and untwist both seats seatbelts. Clean them, and give them a bit of silicone spray, for good measure.
It's actually surprising easy to do, and only one metal clip mount broken.
This info is for the six seater.
Move the seat forward.
Do not start at the top, as I had read you were supposed to do.
To remove the back panel start at the bottom.
Get on gloves or have a rolled up towel.
There are two hand points at the bottom to get a grip of, but without gloves you'll slice your hands.
Get a grip and pul swiftly and straight back.
That will pop off the base of the panel, the rest will pop off a bit at a time.
Lift up at the top and pull back gently.
Detached the seat control cable.
Fix or untwist the seatbelt and clean if you need to.
Bare in mind the ratchet for the seat might be locked on so unfurling the seat belt might not work as the seat is in a forward position.
Re attach the seat control and reverse attach the back panel starting at the top and working your way down.
Job done.
Go have. Cup of tea.