Plumbing advice about whistling sound when taps turned in upstairs toilet

ROSENMARSH

Dear Forum
I need some advice about what to do about whistling sounds when I turn on basin taps, shower, bathroom tap and now when I flush the toilet in bathroom at top of house (2nd floor).  The whistling started with basin tap but not all the time, normally when first turned on.  The whistling sometimes also happens with the shower or bath taps are turned on although less.  However the problem does seem to be getting worse, it now has spread in particular to when the toilet is flushed and if I turn on the basin tap at the same time, there is also a low pitched juddering noise.  I have contacted a local plumber who advised getting a water hammer arrestor or replacing the taps/shower head but the problem is clearly not just the taps or shower head. 

Many thanks for any advice

grumbler

Whistling sounds are usually produced by valves and have nothing to do with water hammer.

If your house has a water tank in the loft, it can be the ball valve in the tank.

ThisIsWeird

Hi.
Does the whistling noise come from the actual tap being used, or from somewhere else?
What sort of plumbing/ boiler/hot water system do you have - combi, cylinder, CWS in the loft?
Is your water pressure pretty strong? Does the cold kitchen tap jet the water into your sink with considerable force?
Is this a recent issue - were things fine before?
Have you had any work carried out on your water supply or plumbing inside the house that involved the mains stopcock being turned?
Such noises and shudders are usually highlighted or execerbated by highish water pressures, tho' not necessarily 'caused' by them; it takes something such as a loose stopcock washer or inadequately-clipped pipes to 'cause' the sound, but they probably wouldn't show with normal pressures (say around 3bar).
So, I suspect you have slightly excessive water pressure, and a plumber can test for this very easily. The cure is a pressure reducing valve installed just after the mains stopcock.
Your plumber's suggestion of a water shock arrestor is fine for the 'judder' part, but I can't see it helping with the other noise.
The issue could be as simple as a loose washer inside the s/c, or in a cold water tank if you have one? What kind of system do you have - combi or stored HW?
Is you s/c easy to access? You can see whether closing it partially off helps. See if you can find a position that removes or reduces the noise and judder, but doesn't also excessively reduce the flow.  If you can, that could help guide a solution.

So, what sort of system do you have?
What is your cold kitchen tap flow like?
What effect does partially closing the s/c have?