Sorry I can't remember the model, I've only taken 1 out. Pipes are in the wall I'm afraid, to replace with new you might have to change the pipe set up
i think i have removed one like this yonks ago. firstly isolate the water to it. undo the nuts on the side of the mixer and then turn the body to either the right or left-can't remember which-and then remove it. i think behind the chrome collars there are two more nuts which will let you remove the two bent pieces.