A dozen schools in England, Northern Ireland and Wales have admitted informally excluding pupils at some stage last year, the BBC has learned.
BBC News asked more than 1,000 secondary schools whether they informally excluded children last year, using Freedom of Information requests.
And six schools in England, five in Northern Ireland and one in Wales have admitted doing so.
A few schools offered reasons for informally excluding children.
More than one school said they had taken the measure to defuse or investigate an incident between…