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@Cupcakes
Update on the wetroom drain.
I was very surprised to find out that the trap is actually a bilge pump. The wetroom has been installed with the outlet from the shower trap at a lower level than the inlet (invert level) of the external drainage. So, presumably to avoid grubbing up and re-laying the external drainage, they installed it with a pump to raise up the waste water.
It makes sense, although it's pretty disappointing.
But what was more disappointing was to find the foul drain was blocked and backing up into the grey water traps in my backyard. And beyond that, the manholes/inspection chambers that would have allowed access to rod this blockage to clear it are covered by brick paving and gravel driveway. FFS, non-maintainable stuff really annoys me. Fortunately I know a drainage company that are good, they turned up promptly, cleared the blockage, CCTV traced the system and explained it all to me.