I have managed to put a slit in the roof lining of my car !! Its only small and its between the sunglass holder and the front courtesy light cluster, that thin strip.

Other than a smart repair or a full roof lining replacement (which i would then do in some fancy Alcantera type stuff). Is there any bit of something that i could ' stick ' over this that would not look to stupid ? Bit of same (beigh) coloured plastic or similar.

I doubt it - whatever you try to patch it up with will look out of place. Just accept it I guess unless you got the time and money to put up a new one.

Yep, what i thought..... a nice fancy Altantera lining maybe a future option... along with a leather upgrade !! Ta.