The NSPCC is training dinner ladies to recognise signs of child abuse as part of its biggest child protection training exercise.
The initiative, which launched on Monday, will target more than 220,000 professionals and support staff, including GPs, dinner ladies, MPs, childminders, police and dentists. They will all receive free modules of EduCare, a child-protection awareness distance-learning programme.
The mailout, launched in Full Stop week, is part of the charity's Talk 'til it Stops campaign and advises workers who have contact with children what to do if they have concerns about a child.
NSPCC director and chief executive Mary Marsh said: "Everyone who works for or alongside children and young people must be able to recognise, respond and report any concerns they have about a child.
"Even professionals who have had child-protection training should take this opportunity to remind themselves what they should do if they are worried about a child being abused."