A new installation should be installed by a gas safe operative, fully qualified and registered in that field and therefore would not/should not install any part of installation ‘not to current standards’
Therefore if you inspect an installation and find ‘not to current standards’, you could have cause to believe the installation has been installed by an unregistered, unqualified person in the area of works involved, therefore Technically you could deem the installation ‘At risk’, for above reasons, it is very much up to the engineers discretion and available information and circumstances
‘‘If an installation has been finished with no compartment notice you wouldn't turn it off’’
Well probably not but that could be part of the signs that indicate something is wrong with the installation and who installed it
imho