Ruth Lesirge, chief executive of the MHF, said children like Jenny need specialist support.

BBC: 'Too stressed to go to school'

The Mental Health Foundation (MHF) says up to 20% of children suffer some form of mental problem, while 10% need professional help.

BBC: One child in five 'mentally ill'

The study is the work of an MHF committee which looked at 1, 200 pieces of evidence from parents, young people, teachers and social workers.

BBC: One child in five 'mentally ill'

The MHF claims studies show that anxiety disorders and those which cause disruptive behaviour, affect round 10% of those aged between four and 20.

BBC: One child in five 'mentally ill'

The MHF also has two information booklets - All About Dementia and Because You Care (for anyone caring for someone with dementia) available on the same phone number or the website.

BBC: Dementia patients 'kept in the dark'

The MHF's figures are higher than other estimates.

BBC: One child in five 'mentally ill'

The MHF is calling on doctors to act in the early stages of dementia, and to recognise that people have a right to know what is wrong with them and to be given clear and compassionate information about their condition.

BBC: Dementia patients 'kept in the dark'