paint crazing

Good afternoon all, I'm looking for some advice on how to deal with a recurring issue I have with a hallway wall. As you can see in the attached images, the wall is cracking and the paint is crazing infront of where there are embedded central heating pipes. The pipes were wrapped in duct tape...

I have a wall on which the paint is all crazing and cracking - see attached pics. The plaster underneath looks like the original lime plaster and appears to be in reasonably good condition aside from some areas where its lost its key. What I've been told is someone previously mixed a whole...