That is the shame of our industry, most repair guys including the big named companies have no skills and very limited kits. One large kit supply company asked me to rewrite their training manual 10 years ago, we disagreed on a very important basic part of training before I walked out of the door and that was the end of that. Can I suggest the best repair guys are not doing repairs for £25.
If you can feel the scratch with your finger nail the it will not come out without causing distortion,I would suggest a new screen.
I have had people here from all over the world, north Wales and I may have taken you up on the offer.