Wow! Thanks Stetheo for the nice words really appreciated!
As regards to your seat I know exactly what you mean as my wives BMW had the same! The only way we improved it was by adding a little heat we used a steam cleaner and left a hot towel on the effected area and it really helped If i'm honest it was not ever completely gone but I would guess 80% better I was amazed it worked!
Now that was a BMW leather so I don't know as not all leather is the same i.e. thickness etc
HTH a little. I did PM T8ups and he said he had none in stock at moment!