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Aye isolation valves are all cheap shite these days they never last.
In regards to affecting the flat down stairs, I’d go chap the door and say I’m gonna do some work the water will be off for an hour they should be ok with that if not. Make up some excuse you had a burst pipe and had to switch it off to fix it 🤷🏻♂️ But realistically there’s something not right if the water stop cock shuts off water to both flats for the mains.
Kitchen tap replacement has hit a snag. No matter how finely I adjust the isolation valve it won't close, is it possible for them to fail? It definitely reduces, but is still more than a steady trickle when the valve's screw is perpendicular to the flow. Only other explanation is that it's being fed from elsewhere, but fucked if I can figure out how.
Unfortunately the stop cock affects the flat downstairs. If I was confident this would be a 30 min job I'd bother them with the inconvenience, but experience tells me that won't be the case.