BS 7858 screening, walked through stage by stage

BS 7858 is usually handed to a new starter as a list of documents to produce. It makes more sense read as a sequence: each stage is there because the previous one, on its own, leaves a specific question unanswered. The exact requirements sit in the current published version of the standard, and this is a walkthrough of the shape of it rather than a substitute for reading it.

Identity, before anything else

Screening starts by establishing that the person in front of you is who they say they are, using acceptable identity documents. Everything that follows — employment history, references, right to work — is only meaningful if it is attached to a verified identity rather than a name on an application form.

The stages in rough order

• –Identity verification, using acceptable documentary evidence
• –Right to work confirmation — see right to work checks for security contractors
• –Employment and activity history covering the period the standard specifies, with gaps identified and explained
• –Verification of the most recent employment or activity directly with the employer, where that applies
• –Character references from individuals able to comment on the applicant's conduct
• –Any criminal record or financial checks that apply to the specific role and contract

The order matters less than the fact that each stage narrows the picture. Identity confirms who. Right to work confirms they can legally be employed. History and references confirm what they have actually been doing and how they have conducted themselves while doing it.

Where it stops being a checklist

The part that turns screening from a form-filling exercise into an actual assessment is the employment history stage, because it is the one most likely to surface something that needs a judgement call — an unexplained gap, an employer who will not respond, a reference that arrives thin or reluctant. See explaining gaps in employment history for how that specific stage is normally handled.

None of the stages are optional extras layered onto a core check. They are each closing a different failure mode, and skipping one because a candidate is needed urgently on site reopens exactly the gap that stage exists to close.

Applying it consistently

The standard applies the same way to every applicant screened under it — there is no shortcut for someone who comes recommended, or who previously held a role elsewhere in the sector. A screening file that looks thin because the candidate was well known to the business is exactly the file that will not hold up if it is the one an assessor picks.