The concept of Service Model Fidelity is considered as a parallel process to Treatment Fidelity in evidence-based psychological therapies. NHS Talking Therapies (formerly IAPT) aimed to increase access to an expanded, upskilled workforce on a national scale. This included systematic training, supervision and front-line service delivery, emphasising treatment fidelity to evidence-based interventions. A further feature of NHS Talking Therapies was modernising and restructuring of the health system that housed these trained practitioners. The term ‘service model fidelity’ (Cromarty, 2016) was coined to emphasise service modernisation aspects as a distinct entity. A definition of the latter is included. Examples of service model fidelity and of service model drift, are outlined to distinguish these from therapist drift. This links to past literature recommending changes in traditional mental health service design and emergent evidence from NHS Talking Therapies. The latter examines publicly available data identifying characteristics of service design, which appear to be predictors of enhanced clinical outcome. Challenges in modernising health systems are discussed and conclusions are made highlighting the crucial role of service model when delivering evidence-based therapies. Suggestions for further research into service configuration to improve experiences of service users are considered. This includes ongoing exploration of service design being more than a qualitative feature, and increasingly appearing as a key factor in enhanced clinical outcome.

1. (1) To identify service model fidelity as separate entity to treatment fidelity.

2. (2) To provide a clear definition of service model fidelity.

3. (3) To delineate therapist drift from service drift.

4. (4) To further examine the role of service model in delivering evidence-based interventions.

Individuals with mental health concerns face many barriers when accessing psychological treatment. Even when patients overcome these barriers, they often do not receive an evidence-based treatment. Although the current literature highlights these issues clearly across psychological disorders, the research is limited in relation to body dysmorphic disorder (BDD).

The aim of this study was to examine psychological treatment barriers, treatment delivery preferences and treatment histories of individuals with symptoms of BDD.

A total of 122 participants with clinically significant BDD symptoms (94% female; mean age = 34.19 years, SD = 10.86) completed the cross-sectional study.

The most frequently reported barriers to accessing psychological treatment for individuals with BDD symptoms were the cost of treatment (41%) and the belief that the symptoms did not warrant treatment (36%). Although 69% of treatment-seeking participants reported previously receiving cognitive behavioural therapy (CBT) for BDD, only 13% of participants appeared to receive best-practice CBT. The preferred modality of future psychological treatment delivery was face-to-face treatment with a therapist once a week (63%), rather than accelerated or remote treatment approaches.

The study suggests that there are significant barriers to accessing CBT for BDD. Reducing these barriers, as well as increasing consumer mental health literacy, is required to improve treatment access and treatment outcomes for individuals with BDD.