Had plasterer put up new coving to match old

It's same in two rooms, pics attached but it's hard to show meeting points on camera from a distance, also a section that he's done has fallen down over night so that's why there's a blank part.

No surprise there, I wonder if he had ever done coving in his life before, because that work is pathetic.
 
Coving can be removed with care. Cut along the top and bottom with a knife to reduce the damage to ceiling and wall.

Take your time....
I smash the middle then chisel off top and bottom bits that are left. Ha.. Multi tool and cut off some remaining adhesive. Most coving falls off easy because of incorrect adhsive
 
You are measuring it incorrectly, the size is top to bottom, not the surface.
It's top to bottom over the c shape surface. Op has a picture with tape measure above. Did show 127mm
 
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