I really shouldn't be indulging your wild conspiracy theories.
Most of the statements we have access to are unsigned so nothing unusual about this.
The fact there's a discrepancy of some 13 minutes in a pre-digital age is evidence of authenticity.
The line would have sounded the engaged tone since it was off the hook. The GPO had the equipment to bypass this, open the line and listen in.
You are more misguided than Bill imo.
There is no mention in the JR statement about being asked to monitor the line and notify any change in line status. Surely she should have mentioned this in her statement
The time is important. All operators had to record their work and she must have known that the police were not still monitoring when she left work because she knew that the line was closed because the police asked for the link to be broken. Again no mention of this in her statement.
Operators were only allowed to listen in if directed by the police and strictly speaking they should only do so under warrant. Given the situation a quick listen in was probably OK but it was not necessary to confirm the line status.
I have covered this in other posts. The operators had a light and a sound (known as the howler) to identify the line status without listening in. In fact the operators asked for the 'off the hook' sound to be lowered because it was initially too loud and hurting their ears
You frown on posts from others that do not confirm your ideas and thinking. Only your own posts are the truth. Is it that you do not wish any breakthrough made by someone other than you.