Mrs Wilson has called for a fully comprehensive inquiry into the hospital blunder. James was allowed to go to the cornershop without supervision from the staff at the Young People's Centre at Goodmayes Hospital.

The teenager had been agitated about his GCSE examination - he is a student of Davenant Foundation School in Loughton and lives in Woodford Green, Essex. He first went missing during his examinations and was foiiund missing in Valentine's Park by park plice looking disoriented. He was admitted to Goodmayes Hospital by his mother who is his carer.

James who is on the autism spectrum then went missig - he had an oyster card with him and a mobile phone. These items are normally retained by hospital staff. The teenager then took a train from Redbridge Underground Station and left at Epping Station on Saturday 12th July. When Mrs Wilson arrived at the hospital on Saturday morning she was told that James had gone to the corner shop. Having waited for several minutes she raised the alarm as she felt something was wrong.

The teenager went missing for five days and was found in Colchester having walked from Epping via Chelmsford.

The mother of the teen with autism has appealed to Prime Minister Gordon Brown and Health Secretary Alan Johnson to take action over the blunder.

Mrs Wilson had feared the worst, she thought her son had died from the cold or from hunger.She has joined forces with a national autism charity, the UK Autism Foundation in calling for an inquiry. Mrs Wilson is also asking Secretary of State for Education, Ed Balls to do an audit to check if children and young people with autism and Asperger's Syndrome are being adequately supervised in schools, colleges, residential centres and hospitals and whether money is being spent on proper supervision.

The British Police carried out an extensive search for James including the use of a police helicopter - two police forces from Redbridge and Essex were involved in the massive search.