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Mr Khan said: "Having looked at the CCTV, do you consider there were any aspects of your performance that fell below the standards required of a police officer that day?"

He added that the government had pledged £40m to improve prison security, including enhanced CCTV, new windows and floodlighting.

Mr Greaney told jurors the prosecution's position was this was "not a complicated case" as the events were captured on CCTV.

They noted she appeared "disinhibited" on CCTV, drank alcohol in class, and swore at pupils.

Police believe a contract killer watched him through a spyhole in his fence at his property, before scaling the fence and shooting him at the only spot not covered by CCTV.