The sample arrived back today and the colour match for the velvet nylon is absolutely perfect, its amazing to see it looking so fresh and vibrant. Thats the good news!, I have compared the sample with a section of original trim from the underside of one of the rear headrests, where the sun has not bleached the colour and also where its not been dirtied by years of wear and tear. So really pleased with the result
The bad news was that because the brushed nylon has a foam backing it cannot be dyed.

Soon as it is exposed to hot fluid, the foam backing between the scrim and the surface material just collapses. After discussion with the John at the Dyeworks, I have tested stripping off the scrim and the foam and they have done the same, so now just the base material will be tested to see if it will take to being over-dyed. Obviously I have to check with the trimmer that he can work with the material without a scrim & foam backing.
It's definitely a "brave" colour scheme!
My trimmer Dean is still looking for brushed nylon without the foam. Fingers crossed again!