I wonder if it will get squeezed into this:
https://www.cpni.gov.uk/critical-national-infrastructure-0
"In the UK, there are 13 national infrastructure sectors: Chemicals, Civil Nuclear, Communications, Defence, Emergency Services, Energy, Finance, Food, Government, Health, Space, Transport and Water. Several sectors have defined ‘sub-sectors’; Emergency Services for example can be split into Police, Ambulance, Fire Services and Coast Guard.
...the loss or compromise of which could result in:
a) Major detrimental impact on the availability, integrity or delivery of essential services – including those services whose integrity, if compromised, could result in significant loss of life or casualties – taking into account significant economic or social impacts; and/or
b) Significant impact on national security, national defence, or the functioning of the state.’
"""