Ken,
I went to a local trim shop and they were able to mix the matching dye for me. I dyed the stitches/seams and it looks great. Might be a better option, I doubt Morgan will do much.
Dye matching is easy. It solves nothing. The seats need a deeper dye ( Morgan agrees). The ridiculous delay is over whether to send new heather stateside and pay an upholsterer here to redo the seats, or to do it all in England. They’ve already conceded that it will be addressed. The delay is starting to be silly.