High pitched sound that rises and falls for hours on end.

Tie up the ball valve on the F&E tank in the loft temporarily, in case the valve is passing slightly and generating a vibration. Are there any drips from the overflow of that tank?
Overflow is dry and we moved the expansion tank into the garage eaves from the loft during the conversion so we wouldn't have worry about any future problems.
 
Is there a 5g mast nearby
No masts of any kind or heat pumps, honestly it's got me stumped. At first I thought maybe sound travelling down the chimney but you listen in the chimney. Total silence. In the corner of the room and you hear it. The corner is actually the middle of a back wall where it returns around the chimney but go into the loft and put your ear hard to the king span and not a peep. There is a radiator on the wall at the chimney but it's total silent.
 
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OK, try again and this time empty the pipes, turn on all the taps upstairs too to be able to empty them.
IS it windy near you? could it be a chimney cowl in the wind?
 
OK, try again and this time empty the pipes, turn on all the taps upstairs too to be able to empty them.
IS it windy near you? could it be a chimney cowl in the wind?
Definitely not the wind, it's still making the damn sound and I can hear it from the kitchen just now
 
Relief valve lifting on your sealed system?

Nozzle
Can't hear anything or feel anything if I put my hand on it. Tundish is dry. I did wonder if it was pressure related as now a few showers have been ran and sinks being used etc. The sound is gone.
 
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