Hi!

For the past 2 weeks there's been the sound of water running 24/7 under the kitchen sink, and I can also hear it in the bathroom which is above the kitchen. There's no loss in pressure, and turning the stopcock has no effect.

Does this indicate a leak in the main pipe?

Also, from under the kitchen sink and in the bathroom I can now hear my neighbour's washing machine filling up; sounds like ssshhhhhhhhhhhhh; and really loud, which wouldn't be so bad if they didn't use it constantly. I'm not exaggerating when I say it's on 24/7. I'm wondering if they're running a laundry service and sleep in shifts to keep the machine running.

It's a puzzle. Not sure if I should call United Utilities or a plumber.

Thanks very much for any help.

Do you have a water meter?  Perhaps turn off the stopcock for a few hours and see if the meter changes indicating water loss.

Let us know how it goes please.