Looking back as the case was reported as it progressed - here is the main bit of the prosecution by the looks of it :-
"The Health and Safety Executive is prosecuting the school's headmaster James Porter, 65, for an alleged safety breach.
The prosecution claims that Kian should not have been allowed unsupervised access to the steps.
On Monday, prosecuting counsel Nicholas Jones said there had been no physical barrier to the steps and only one teacher watching 59 pupils in both upper and lower playgrounds and she was unable to monitor the steps from she was.
Mr Porter, who also owns the school, denies that as an employer he failed to ensure as far as was reasonably practicable that pre-school age children were not exposed to the risk to their health by falling on a flight of steps. "
and heres the bit about supervision:-
"The jury heard from Stephen Scott, principal inspector in charge of the HSE investigation, who said that many factors were involved.
He told the jury that, while he had a great respect for a lot of the ethos at Hillgrove, "what I had were very serious concerns about his awareness of the kind of supervision ratios and standards at other schools, and the actual supervision and exposure to hazards for three to four-year-olds".
He added that greater supervision was required for three-year-olds, and that was expected by parents. "
The case was successful as the court must have decided that preventing access either by adequate supervision or a physical barrier was 'reasonably practicable' ie fairly easy to do with significant rewards (ie safety of pupils)