In an earlier contribution to this discussion,
wrote:


breeze block walls are especially good at self support, due to the
depth of the blocks. If youre left with a hole after replacing your
broken bath, you can fill it with breeze block, brick, stone, or
cement mortar.


Agreed. As far as the waste pipe is concerned, I would chop a bit more block
out, immediately over the pipe, and support the blocks above with a
light-weight lintel (the sort which is made out of a single sheet,
corrugated in cross-section. And then put some mortar back, between the pipe
and the lintel to seal it all up. At least the pipe wouldn't be supporting
anything then. [It probably isn't now, TBH - 'cos blocks hold themselves up
quite well when you cut an aperture in an established wall].
--
Cheers,
Set Square
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