This map is a great idea, thanks for putting it together.
I have a list of ex siren locations, would this be of interest to you for the map?
I've noticed on the map you have a few locations where they have now been removed.
St Joseph's High School Horwich, Bolton -
53°35'9.26"N 2°31'40.59"W
It was a standard Cold War Era looking siren. Quite large. I'm not sure on the specific model but it looked like a carter. I was at school at the time and a friend pointed it out to me and said it was for World War 3.
A few weeks later the siren was removed around 1996, but the platform was left. This would have been for the cold war as the school was built in the 50's.
Atherton Fire Station, Gloucester Street, Atherton M46 0JT
53°31'36.28"N 2°29'40.00"W
I never saw this one, but i know a few people who remember seeing it on top of the training tower and hearing it being tested into the 1980's.
Holmcombe Brrok Primary School Longsight Rd, Ramsbottom, Bury BL0 9TA
Documented on this site, under cold war:
https://www.lancashireatwar.co.uk/
There is also a big list of siren locations on this website, you can still see the siren cabinets and poles on street view:
https://historymap.info/Air_Raid_Sirens
Apologies if this is of no interest, I'm trying to build a list of ex siren locations from the Cold War/WW2.