So.....an update.
First off, the courtesy car mentioned in post #28 turned out to be a bit poor, both for my friend's needs and as a tool for getting around Burton. A BMW 318d M Sport - bloody uncomfortable if you're used to a Jaguar XJ8 as your daily hack. This has now been replaced with a 520d estate, which is orders of magnitude better.
Second off, the seats have been worked on. Just a bit.
Remember how bad the drivers seat looked in my opening post? It went from that to this:
Here the cushion is being worked on:
Here it is mostly finished:
The seatback for the passenger side:
The rear seats before a finishing touch was applied:
Now, about that finishing touch....
At some point, it was decided that different coloured piping would be a rather good idea. So here's how that worked out:
Got to give a shout-out to James Bartley @ Perfection Group who did the work. Very professional, very friendly, very talented. I'd recommend the firm to anyone.
***edit***
Tell you what, we got bloody well soaked putting the seats back in. And as soon as we were done, the clouds parted and the sun came out. Bleedin' typical. Still, they're in now and looking a damned sight better than they did.