Running water both downstairs and upstairs seems to hit the surface it's aimed at (eg sink, shower) and go everywhere. Just washing my hands means walls, windows, floor within maybe a two-foot radius are sprinkled with water. God, I'm so tired of wiping surfaces.
We've reduced the water pressure as much as we can while still getting running water to the first floor.
In my mind it's as though the stream of water needs a baffle to keep water falling out of the tap like it was a hosepipe, but is that even a thing or have I made it up? Have had no luck googling and plumber just advised us to reduce pressure.