best filler

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’m fixing the stair handrail to the wall and wanted advise on the best way to do it. The builder initially used caulk to seal it to the wall, but movement cracked that. I have removed the caulk, painted the bare plaster behind, and now my thoughts were to fill the gap rather than push it to the...