The National Autistic Society is basing its Autism Awareness Week around the theme of planning for life, to highlight the lifelong difficulties experienced by people with autism spectrum disorders.
A new report, which focuses on seven people with such disorders, has been sent to members of the All Party Parliamentary Group on Autism, relevant MPs, civil servants and local authorities.
A Place in Society recommends the duplication of existing projects that identify current and future service needs of young adults with autism, and increased training for teachers, police and medical professionals who deal with them.
Stuart Notholt, director of policy and public affairs, said: "While a statutory framework exists in the UK for transition planning after compulsory education, its implementation is at best patchy."
The charity will be helped by its partner Vodafone UK, which will run press ads for six weeks plus a one-week radio campaign.