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The white box with the black face is a waterproof toilet roll holder, there's a surprising amount of them online but this one seems to work, the black container behind the toilet is waterproof as well and has a couple of extras. They seem to be working well atm.
The water from the shower drains straight away and there's zero build up of water on the floor (kind of amazed tbh). In reality the shower is only going to be used when we have guests so even if it was a problem it wouldn't be a big issue to just take the toilet roll out when people have a shower.
Finally had our toilet/wetroom installed (well everything except the electrics), and as someone who completely fucked up my back a few weeks ago it feels pretty bloody good to have a toilet that isn't just on the 2nd floor in the loft conversion!