Having more than a nodding association with Vetting & Barring (VBS) from a systems point of view we should remember that it did have some good points, not least that it removed the need for an individual to have to be independently CRB cleared for each and every interaction that an individual has with an organisation covered by the requirement, every year or so. So a teacher who also runs a scout group and helps to manage their child's football club, and is perhaps also a parent governor for a different school, has to have 4 different CRB checks, as they are not transferable.
Vetting & Barring reduces this to 1 which registered the individual and then allowed them to quote that registration when joining another organisation. The need to renew the registration was removed by the monitoring of the persons interactions with protection authorities. Thus if anything occurred that impacted their registration, like being arrested for assaulting a minor, it would automatically suspend their registration and organisations that employed that person could be informed, which is where it all starts to go horribly wrong.
Trouble is that there are a whole raft of unintended consequences from that very simple and laudable aim. Firstly, a lot of people who volunteer do not like the idea of being vetted, even less would they like the idea of being monitored for the rest of their life, unless the Home Secretary let them off. Why might you ask was this the case, well that is because a retired teacher, say might be convicted of an abuse, so there might be a need to go back and check all former interactions with children to see if any other offences were committed, and any victim support needed. Again, a reasonable idea, well no it isn't, the civil liberties issues that arise, just from the little I've said are horrendous, not only that, but if you take what's happened with standard CRB checking, it would actually mean that virtually anybody who could possibly interact with a child or vulnerable adult would end up being checked and registered. Companies that carry out property maintenance check their employee's because they don't know which ones might have to work unsupervised on a Home.
Also what constitutes a relevant crime, would you want a convicted thief looking after your Granny, or Child, probably not, but what were they convicted of stealing, and would they even remotely consider stealing from a child or an elderly person, probably not, and if they are over 30 they probably stopped stealing when they were in their early 20s. Ultimately a system can't make these decisions, because it can't decide to break the rules, only a human can.
What we really need is a VBS that lessens the burdens of the CRB system, without the draconian implications of the current VBS. Here's a couple of thoughts that went through my head when looking at the system requirements and legislation. What happens if someone's registration is suspended, what assumption will most people spring too. What happens when a drunk school teacher crashes a mini-bus full of kids, do we stop all people with drink related convictions driving children? I think it goes further than just Innocent until proved guilty, because even when proved guilty, you can be redeemed, and people make mistakes with their lives.