Autism spectrum disorder (ASD) services for adults are under increasing pressure, particularly in a major urban centre like London. This article explores the rise in demand for autism assessments, highlights challenges specific to London, and explains what to expect from a private diagnostic process.
Understanding Autism in Adults
Autism is a neurodevelopmental condition that affects communication, behaviour, social interaction, and sensory processing. While some people receive a diagnosis in childhood, many others — especially women and those without learning disabilities — go undiagnosed until adulthood.
In adults, autism can present as:
- Difficulty understanding social cues or maintaining relationships
- Strong preference for routines and predictability
- Sensory sensitivities (e.g. to noise, light, or texture)
- Intense interests or focus on specific topics
- Challenges with emotional regulation
- Masking behaviours that conceal distress or effort in social situations
Studies suggest that autism may be significantly underdiagnosed among older adults. One study estimated that only 3.5–7.9% of autistic individuals over the age of 50 in England have a formal diagnosis.
Why Demand for Assessments Is Increasing
Over the last two decades, there has been a substantial rise in autism diagnoses. Between 1998 and 2018, UK diagnoses increased by 787%. This reflects a combination of growing awareness, better diagnostic tools, and broader understanding of how autism presents — particularly in adults.
However, access to assessment remains inconsistent. A 2024 study found that some NHS centres were more than twice as likely as others to diagnose adults with autism, highlighting considerable variation in diagnostic practices across the country.
NHS waiting times are also a major barrier. As of mid-2023, 83% of adults referred for an autism assessment had been waiting more than 13 weeks. Only 6.3% had received a first appointment within that time frame. These delays have led many people to explore private assessment options.
Autism Assessment in a Private Setting
At Flint Healthcare, private autism assessments are designed to be detailed, collaborative, and respectful of each individual’s lived experience. The process typically includes:
- Structured clinical interviews using recognised tools such as ADOS-2 and ADI-R
- Comprehensive developmental and social history, exploring early childhood behaviours and current patterns
- Evaluation of co-occurring conditions such as ADHD, anxiety, depression, or OCD
- Consideration of masking or diagnostic overshadowing, which may make recognition more difficult
- A clear diagnostic opinion, followed by tailored recommendations and a written report
Where appropriate, recommendations may include therapy, psychoeducation, support with employment or relationships, and guidance on accessing reasonable adjustments at work or in education.
The London Context
Living in London presents a unique set of challenges for individuals with undiagnosed autism. The fast pace, sensory overload, and high demands of work and commuting can increase stress, burnout, or emotional overwhelm — especially for people using masking strategies to cope.
Increased awareness, better representation, and greater openness about neurodiversity have led many Londoners — particularly women and older adults — to question whether autism may explain longstanding challenges.
The Flint Difference: Specialist, Consultant-Led Assessment
At Flint Healthcare, all assessments are carried out by consultant psychiatrists with specialist training in adult autism diagnosis. This means you will see the same clinician for your assessment, diagnosis, and any follow-up support, ensuring continuity and trust throughout your journey.
Our clinicians use gold-standard diagnostic tools and take time to understand the whole person, not just symptoms. This joined-up approach helps ensure you leave the process not just with a report, but with clear guidance on next steps and support tailored to your life.
Taking the Next Step
If you’ve wondered whether autism could explain some of your experiences, seeking an assessment can be the first step toward clarity and support.
If you’re ready to explore that step, get in touch with Flint Healthcare today.
