Autism Spectrum Disorder (ASD) is estimated to affect 1 in 100 people.

ASD is characterised by impairments in:

  • Reciprocal Social Interaction
  • Social Communication
  • Social imagination and Social Understanding
  • and Stereotyped behaviour, restricted interests or marked resistance to context changes are a common picture.
  • Unusual sensitivity to sensory stimuli is
  • common.
  • Co-morbidity and dual diagnosis are often
  • seen in people with autism.

Diagnostic Guidelines

Gold standard diagnostic practice for Autism Spectrum Disorder

Scottish Intercollegiate Guidelines Network

National Institute for Health & Care Excellence

Please contact on:

01561 320885

or complete the contact form


John Forrester has over twenty years experience in ASD specific assessment work and continues to develop assessment practices and processes. Standard screening tools and other instruments are employed, when appropriate, during the course of any assessment. Examples of the range of assessment related work include;

  • Diagnostic assessment, opinion on diagnosis, in collaboration with other professionals whenever possible and in line with multi-disciplinary practice guidelines.
  • Behavioural assessment-evaluation of specific or generalized behavioural concern.
  • Profiling and assessment of support needs, context specific or general.
  • Forensic/Criminal Justice: Often involving evaluation of risk to self/others in relation to ASD behaviour and cognitive differences experienced by individuals. Diagnostic assessment often precedes further support need or forensic evaluation - individuals with ASD who offend often enter the criminal system without a diagnosis. Guidelines and recommendations to reduce the risk of recidivism are regularly provided to professionals and others involved. John is a vetted member of The UK Register of Expert Witnesses. Full CV and further details on John Forrester's involvement in criminal case work can be found at
  • Employment/Education/Vocational assessment, providing recommendations for approaches or supports.
  • John Forrester can receive referrals on a private basis, or from health, social work, education and other departments.

For enquiries email or phone 01561 320885.

Who we work with

  • Individuals
  • NHS & local authorities
  • Criminal Justice Departments
  • Employers
  • Voluntary sector
  • Families & carers
autism consultant scotland