I think you've done the right think, OP. Chances are that if someone applied for a job as a cleaner in a school with convictions for violence, they wouldn't get the job. Getting the convictions while already being employed might not lead to the loss of a job - the school would know the person better and be in a better position to make a risk assessment and a decision as to whether the employment can continue.
But I think the school would prefer to be in a position to actively make that decision, rather than be left to trundle on until the information is triggered in some way.
I am a criminal lawyer, and I wouldn't necessarily expect the police to notify someone's employer. Probation will be involved if there's a suspended sentence in place, and they would certainly raise concerns if someone had relevant convictions and was known to be working with children, but you're relying on him having given accurate information to his probation officer, and that probation officer making a decision to act upon it. There's a chance that the information never filtered through to the school.
Suspended sentences aren't generally given out lightly. If someone gets one, it's generally an indicator of one of three things:
- An offence too serious for a community order
- Previous offences of a similar nature
- A single previous offence and non-compliance with a community order
This could be someone whose circumstances mean that there's unlikely to be a repeat of the violence, or it could be someone who's in the middle of an escalation of offending. The school should hopefully be able to put their hands on information that will put them in a position to decide whether they want to take a risk on him being the former, rather than the latter.