I didn't come back to this as it's been a crazy week...
My side neighbour on the first floor has been away all week, there is a drip, as I say, coming from his outflow pipe directly from the bathroom.
While he's been away I've slept well every night, until last night, I got woken at 6am this morning to my bed vibrating, and today is my day off and I hadn't got to bed until 2am last night...Side neighbour still appears to be away, so there would have only been one flat occupied. That is the flat underneath him. I have suspected this flat before too, I'm aware that the PRV is likely to be in the bathroom of this flat (because the mirroring flat opposite has one there)....
Getting sick to death of this after nearly two years. Is there any way I can go outside when this is happening and turn off the water to the building? Just to see if it stops, I won't leave it off. I'm not getting any help from any of the landlords here except my own but she comments on the flat all the time, tiny bits of dust on a surface, etc, (the place is clean and tidy, she's even suggested a cleaning schedule to me and getting a cleaner, you'll have to take me on my word that this flat is VERY clean and tidy, it's just an oddity about the landlady, and it's just added pressure, the previous tenant mentioned the same thing, she's 80 year's old), so I'm always reluctant to call her.
If downstairs and side neighbour are both away, it's GOT to be coming from the only other indirectly adjoining flat, the person underneath my side neighbour? Hasn't it? But then how do I explain all the vibration that happened when THAT flat was vacant a few weeks ago.....THAT suggests it's my side neighbour, and even though he's away, his outflow pipe is the only one that's leaking.
I know no one has the answer, but wondering if anyone can hazard a guess....once I'm clearer on where it's likely to be coming from, I can tackle that person. Thanks for reading, I won't keep posting, I will leave it after this unless asked anything.