Thanks for your responses.
I've tried the Gliptone scuff master stuff (it's not a direct colour match, one of there previous Morgan blacks from a 1984 sample) and it's a darker mat black. I'd have to colour a whole panel or item really.
However, in any event it won't remove or repair any damage to the surface.
When I ordered the black Scuffmaster, it came with a little bottle of white to mix a black to match