The prevalence of mental health conditions is high for autistic adults. Yet, the IAPT manual states that referral rates into NHS Talking Therapies Services (NHS-TTS) do not reflect this nationally. Non-adapted treatment has been identified as a key barrier to accessing these services. It is therefore imperative that clinicians adapt to the needs of autistic individuals to make treatment accessible and effective. However, there is limited research in the field, especially for low-intensity cognitive behavioural therapy (LICBT). This service evaluation explores adapted LICBT for autistic adults within Plymouth’s NHS-TTS and Autism Service. It investigated clinical outcomes of adapted group and one-to-one LICBT with 84 participants. It hypothesised that psychometric measures for anxiety and depression would be lowered on treatment completion, whilst exploring whether either intervention showed a greater reduction. Additionally, semi-structured interviews were conducted with six participants from the sample to gather perspectives on what aspects of treatment were favourable or require improvement. A factorial ANOVA revealed that psychometric measures reduced on completion across both interventions, with a greater decrease for one-to-one treatment and the anxiety measure. In addition, four themes and nine subthemes emerged following a thematic analysis, which focus on different aspects of treatment, such as content, structure, interaction, and barriers to engagement. Findings indicated that adapted LICBT was associated with lower anxiety and depression for autistic adults. This consequently has implications for improving the current LICBT provisions being offered to autistic adults within the NHS-TTS.

1. (1) To understand some of the barriers autistic people face accessing an NHS Talking Therapies Service (NHS-TTS) and cognitive behavioural therapy (CBT).

2. (2) To reflect on the importance of adapting practice and CBT for autistic people.

3. (3) To present potential adaptations to low-intensity CBT for autistic adults with anxiety and depression.