INTRODUCTION: At least one in four people treated by the primary care improving access to psychological therapies (IAPT) programme in England experiences distressing psychotic experiences (PE) in addition to common mental disorder (CMD). These individuals are less likely to achieve recovery. IAPT services do not routinely screen for nor offer specific treatments for CMD including PE. The Tailoring evidence-based psychological therapY for People with common mental disorder including Psychotic EXperiences study will evaluate the clinical and cost-effectiveness of an enhanced training for cognitive behavioural therapists that aims to address this clinical gap. METHODS AND ANALYSIS: This is a multisite, stepped-wedge cluster randomised controlled trial. The setting will be IAPT services within three mental health trusts. The participants will be (1) 56-80 qualified IAPT cognitive behavioural therapists and (2) 600 service users who are triaged as appropriate for cognitive behavioural therapy in an IAPT service and have PE according to the Community Assessment of Psychic Experiences-Positive 15-items Scale. IAPT therapists will be grouped into eight study clusters subsequently randomised to the control-intervention sequence. We will obtain pseudonymous clinical outcome data from IAPT clinical records for eligible service users. We will invite service users to complete health economic measures at baseline, 3, 6, 9 and 12-month follow-up. The primary outcome will be the proportion of patients with common mental disorder psychotic experiences who have recovered by the end of treatment as measured by the official IAPT measure for recovery. ETHICS AND DISSEMINATION: The study received the following approvals: South Central-Berkshire Research Ethics Committee on 28 April 2020 (REC reference 20/SC/0135) and Health Research Authority (HRA) on 23 June 2020. An amendment was approved by the Ethics Committee on 01 October 2020 and HRA on 27 October 2020. Results will be made available to patients and the public, the funders, stakeholders in the IAPT services and other researchers. TRIAL REGISTRATION NUMBER: ISRCTN93895792.

• Keywords
• anxiety disorders, depression & mood disorders, primary care, schizophrenia & psychotic disorders,
• MeSH
• Health Services Accessibility MeSH
• Mental Disorders * therapy   MeSH
• Cognitive Behavioral Therapy * methods   MeSH
• Humans MeSH
• Primary Health Care MeSH
• Psychotic Disorders * therapy   MeSH
• Randomized Controlled Trials as Topic MeSH
• Check Tag
• Humans MeSH
• Publication type
• Journal Article MeSH
• Research Support, Non-U.S. Gov't MeSH
• Clinical Trial Protocol MeSH

Early Intervention in Psychosis (EIP) services have been youth-focused since their inception. In England, recent National Institute for Health and Care Excellence (NICE) guidelines and new National Health Service (NHS) Standards for EIP recommend the expansion of the age acceptability criterion from 14-35 to 14-65. In the Cambridgeshire and Peterborough EIP service (CAMEO), we ran a service evaluation to assess the initial impact of this policy change. It aimed to elicit EIP treatment components utilization by patients with first-episode psychosis (FEP) aged over 35, in comparison with those under 35. We found that the over-35s required more contacts from EIP healthcare professionals, especially from care coordinators (coefficient = .239; Robust SE = .102; Z = 6.42; p = 0.019) and social workers (coefficient = 18.462; Robust SE = .692; Z = .016; p < 0.001). These findings indicate that FEP patients aged over 35 may present with more complex and sustained clinical/social needs. This may have implications for EIP service development and commissioning.

• Keywords
• Age inclusivity, Early intervention, Over-35s, Psychosis, Service use,
• MeSH
• Early Medical Intervention MeSH
• Humans MeSH
• Adolescent MeSH
• Psychotic Disorders * therapy   MeSH
• Aged MeSH
• Mental Health Services * MeSH
• State Medicine MeSH
• Check Tag
• Humans MeSH
• Adolescent MeSH
• Aged MeSH
• Publication type
• Journal Article MeSH
• Geographicals
• England MeSH