Removing wallpaper

Thats finish plaster. To get a nice smooth finish you need to be good with a plastering trowel.
To remove the scratch marks you need to go over them with a very fine grade glasspaper. The finer the better and rub lightly. All you are trying to remove is the tops of the ridges you have made with the previous rub down. Then give it a good wash down with a damp rag, rinsing it often and also maybe changing the water frequently. Allow to dry completely before proceeding with painting.
 
That is extra-ordinarily expensive and a kilo will not go far. Having done the job you are talking about dozens of times, no another couple of coats will not hide the imperfections you describe. You will have to flatten down any "chips" by further sanding, you can see them better by shining a bright light across the wall at a suitable angle. Next, it can be a bit laborious but the "scratches" will have to be filled in by making up a a pot of ordinary filler (far cheaper than that B & Q stuff) to a consistency of clotted cream and using a knife like this:-https://www.toolstation.com/prep-premier-filling-knife/p83766 to spread it evenly and thinly over said problems. I always spread it slightly proud (no more than 1mm) then once it is dry use a fine sand paper wrapped round a block to finally smooth and flatten it. You will go through a bit of a learning curve as I did many years ago but it's very satisfying when you finally paint over the nice flat surface which you have achieved. Of course you could always get a plasterer to do a skim coat but is not cheap and ceratinly not DIY LOL.
 
We live in a big old rambling 1870 Victorian house and have used lining paper over the old 150 year old horsehair plaster after painstakingly removing all of the 1970's woodchip. You can indeed see some imperfections but in our case it enhances the character of the house. In a more modern house I can see that it might look a bit naff.
 
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