Prof Pilling, who worked on the guidance suggesting classes for parents of children with conduct disorders, said treating the disorder would save money that would otherwise be spent in the criminal justice system.
By any standard that Nice operates, these treatments are clearly cost effective.
If you put in criminal justice costs, these interventions are dominant. It's actually cheaper to provide them than not to provide them, they're saving money.
The cost of not treating a 10-year-old with a conduct disorder for the next eight years, over the rest of their childhood, are in the £80,000 to £100,000 range.
More top news
Spring on fast forward to Summer.
Around 45 million registered voters in England, Wales, Scotland and Northern Ireland will vote in elections across the UK.
Vardy lookalike Lee Chapman, who made it onto the Leicester City team bus, tells ITV News what the footballer told him.