Got a pic? I’ve got a magic builder arriving tomorrow who loves answering this kind of question (while rolling his eyes and adding zeroes to the bill).
Looks like the wall might have been skimmed without removing the skirting board. Does that seem possible or something you could find out with a little investigation?
That's just Ogee (Ogee 1 from Bobbo's diagram - the top is not normally in line with the bottom part from skirting I've seen), with a thick layer of paint on, isn't it?
Got a pic? I’ve got a magic builder arriving tomorrow who loves answering this kind of question (while rolling his eyes and adding zeroes to the bill).