Sounds like you have un-clipped pipework in the walls, bad practice.
If it’s a stud wall, I have lessened this once by cutting out a section of head plate in the loft and sliding a length of 15/25 climaflex down the pipe.
Can you open up the other side of the wall?
If it’s a stud wall, I have lessened this once by cutting out a section of head plate in the loft and sliding a length of 15/25 climaflex down the pipe.
Can you open up the other side of the wall?