Hi all. I am updating our first floor bathroom.
Having created extra space by removing a cupboard
that protruded from an adjoining room I want to
move the toilet pan 90 degrees from one wall to another.
This will mean moving the connection at the stack (internal)
90 degrees as well. What's the easiest approach?
Do I need to remove the existing boss and install a
new one or are there other options.

Also, once installed I will be boxing-in some pipework
including the stack. What's the best material to use
if I am then tiling to finish?
All advice greatly received as always!