Schools are failing to warn children of the dangers of drugs and alcohol, education watchdog Ofsted said yesterday.

Some of the schools surveyed for a new report were not focusing enough attention on the emotional aspects of sex education lessons, inspectors said.

And all the schools visited which relied on lunch deliveries rather than cooking fresh food on site were rated poorly.

Ofsted said most of schools in the survey, which were chosen for their good records on health matters, were making "a valuable contribution" children's well-being.

But inspectors said all schools in England should make sure they highlight the dangers of drugs, alcohol and tobacco.

Drug education in schools "continues to present a very mixed picture", the report said.

"While drugs education featured in most schools' planning, and there was provision for drugs education in all the schools, there was too little focus on the social implications of drug-taking.

"Pupils were not made sufficiently aware of the effect that drugs, smoking and alcohol might have on their lives.

"Schools rarely discussed the mental problems which may lead to substance abuse and there was wide variation in the support provided for teaching staff to raise their awareness of such issues through regular updating." n Teachers are calling for teenagers to be taught parenting skills in school.

Pupils taking GCSEs should be taught how to change a nappy and discipline children, said Lynn Edwards, chair of the Professional Association of Teachers (PAT).

She will propose a motion at her annual conference next week calling for "parent-craft" to be a compulsory subject for 14-16-year-olds.