Interior trim paint?

[Censorious]

Does anyone have a source for a touch up paint for car interior finishes?

I have a couple of scuffs on the dash that have gone through the top layer grey finish and you can see the black colour of the plastic beneath.

I looked at Halfords and they do a bumper spray but not really what I want; I need a satin grey that can perhaps be mixed myself to match with the addition of a little white or black to adjust the shade.

I used to have a good kit for velour seats back in the day; you could mix different shades of fibres together to get a match and layer on top of a specialist glue to fill in things like cigarette burns. It was a great little kit and I'd like something similar but for paint finish.

Any ideas on a supplier for such paint?

Mods please don't put this in the valeting or the gardening section or any other dusty abandoned corner of PH!

It'd be nice to get a few replies

Thanks