Anyone else hear the high pitched noise / alarm this morning?

Ive heard it before a while back, goes on for a long time (not 100% sure as I was drifiting in and out of sleep with it going on)

Next door neighbour heard it. We're down the bottom of Guys Cliffee.

The sound was coming in and out on the wind so it was a distance away I think.

A friend heard it in Whitenash.

All I can think it was was the flood alarms at the Water treatment Plant at the top of Newbold Common, back of Lillington.

Id love to know what it was.