Rover 200 & 400 Owners Club

Hi, I've got a facelift Rover 25 54 plate & the facia has some of the non reflective matt black coating missing which has revealed a shiny plastic base material, has anyone encountered this before if so how did you re touch the damaged areas & if you managed it using what type of material.
Fingers crossed I hope someone has the answer because these shiny spots are unsightly & really annoying. Thanks in anticipation of assistance.

I have a similar problem starting to occur on my wife's 05 build 25 that we have owned from new. It's not something I have come across before. I would be interested in a remedy for it.

Any chance of some pictures?