As Alarm Services are duties of the regions it can´t be organized at national level, whereby on national level the data should be aggregated.
Here is a link to the symbols used in the UK...
https://www.gov.uk/government/publications/emergency-responder-interoperability-common-map-symbols
The JESIP app also has good info...
The project seems to derive from the vendor´s side, whereby it would be of more interest to derive from the user´s side.
As Alarm Services are duties of the regions it can´t be organized at national level, whereby on national level the data should be aggregated.