Mr.B, why not enlighten us all? Unlike yourself, not everyone has/will have access to the info.
If you're prepared to say ...
A very reliable source tells me that if you read the NPAS Police Ops Manual then it actual says that to use a site at night then the site must be surveyed and kept in the site landing directory (each site survey valid for 12 months).
... surely through your reliable source, you can tell us what the NPAS Police Ops Manual says about PCSO's and how it differs from CAP 612
