Got the seat back from the upholsterer a few days ago and he's done exactly what was asked of him. The brief was, black leather, tuck and roll and keep it as thin as possible to maintain the contour of the base.
Looks so thin it's difficult to think it's padded but it is, not saying that the springs won't be doing most of the work, but give it a squeeze and it's soft.
If you want any work done you could do a lot worse than talk to Bespoke Auto Interiors in Letchworth.