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Introduction Cognitive Behavioural Therapy for Insomnia (CBTi) was introduced at Wye Valley NHS Trust in line with NICE guidance (2025). Insomnia affects up to one-third of the UK population and is associated with significant health and economic burden. CBTi is an established treatment for patients with insomnia. This audit evaluated early outcomes of a newly established CBTi service using validated subjective sleep measures.Methods This retrospective clinical audit included all patients who completed the CBTi programme at Hereford Hospital between August 2024 and January 2026. Patients with incomplete treatment or missing outcome data were excluded. CBTi was delivered 1:1 by a psychologist.Actigraphy and sleep diaries were performed pre-treatment to measure sleep efficiency (SE), sleep latency (SL), and wake after sleep onset (WASO). The Sleep Condition Indicator (SCI) was recorded at baseline and each session. Post-treatment outcomes were reassessed using sleep diaries and SCI.Clinical response was defined as an increase in SCI score of ≥7 points and/or a post-treatment SCI score >16. The primary outcome was the proportion of patients demonstrating a clinical response, benchmarked against a predefined target of ≥70%. Paired statistical analyses were performed using paired t-tests or Wilcoxon signed-rank tests as appropriate, with results reported as mean ± SD or median (IQR). Statistical significance was set at p<0.05.Results Twenty-nine patients (16 female, age 55±13.7) met inclusion criteria. The median number of CBTi sessions completed was 4 (range 3–7). Overall, 93% of patients demonstrated a clinical response, meeting the criteria of an increase in SCI score of ≥7 points and/or a post-treatment SCI score >16, exceeding the predefined benchmark by 23%. Significant improvements were observed in all measured outcomes, all p<0.0001 (table 1). Non-responders commonly demonstrated reduced adherence to behavioural components of CBTi, including stimulus control and sleep restriction.Conclusion CBTi was associated with significant improvements in insomnia severity and sleep continuity. These findings support the effectiveness of CBTi delivered in routine clinical practice and highlight the need for CBTi to be made more widely available and accessible to meet the high population burden of insomnia. Limitations include small sample size and single centre.Abstract P32 Table 1Sleep outcomes before and after CBTi (n=29)Data presented as mean SD or median (IQR).