National Protective Security Authority
The NPSA is accountable to the Director General of the Security Service (MI5)  and therefore operates under the Security Service Acts 1989 and 1996. NPSA is not subject to FOIA.  NPSA used to be called the Centre for the Protection of National Infrastructure (CPNI).Under Regulation 4 of the Environmental Information Regulations (EIR), environmental information relevant to the functions of the Security Service, which does not adversely affect national security can be requested.