You make it sound as though it was benign when it was anything but.
The relationship had been over for years. There's no record of Sheila complaining to anyone about Colin.
Are you going to tackle Bill about the police training manual?
The Manual you refer to is for 'tactical public order' situations. That terminology refers to how the police respond to, manage and counteract public demonstrations, riots and similar incidents. Obviously there will be something in there about the deployment of armed police, but that has nothing to do with the situation at White House Farm, which was not a public order incident.