Thanks Alan.
I have a bad back and find most new car seats uncomfortable/painful. I had long test drives in a Jazz ES, found it OK 'ish, and bought one.
My first drive of about an hour resulted in back problems-something in the seat was pressing on my spine, which I hadn't experienced in the the test car.Obviously , this almost became a disaster- brand new car , but unable to drive.
Luckily I found this post and modified my seat with the cable ties, could instantly feel a difference, and so far the fix seems to be working.
It's amazing what you can learn from these forums !