I am not aware of the particular role that the Privy Council Office would play specifically in providing security arrangements, but I am sure that all of that information would come forward as soon as the Public Complaints Commission is allowed to get on with its work, and to hear from all of the relevant witnesses.
Witnesses from the Privy Council Office will testify before the Public Complaints Commission
It is not stated who the witnesses are. I think the system got it wrong because it made an inappropriate inference
( z1 testify :ARG0 ( z2 person :ARG0-of ( z3 witness :ARG1 ( z4 government-organization :name ( z5 name :op "Privy" :op "Council" :op "Office" ) ) ) ) :ARG2 ( z6 government-organization :name ( z7 name :op "Public" :op "Complaints" :op "Commission" ) ) )