If it was me, I'd probably want to just cap the soil/waste pipes in situ (just in case).
Any water pipes you need to cap at the t that feeds them from main circuit, to avoid getting dead ends, which can lead to stagnant water.
I think I understand what you’re saying, but anything that could involve flooding etc I’d pay a plumber to do. I’ll note the advice though and check they do so.
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If it was me, I'd probably want to just cap the soil/waste pipes in situ (just in case).
Any water pipes you need to cap at the t that feeds them from main circuit, to avoid getting dead ends, which can lead to stagnant water.