Trial of an Online Group Psychotherapy Intervention for Common Mental Health Disorders

Inclusion Criteria: * 17 years old and over * Literate and fluent in the English language, which would enable group interactions and learning via online materials * With access to an internet-connected device (e.g., computer, phone) and confidential space * Referred to NHS-TT services * Assessed by a qualified psychological professional and deemed to be eligible for high intensity CBT (this includes low risk of harm to self or others) * Currently on waiting list for high intensity CBT and not accessing any other psychological interventions. This includes patients accessing pharmacotherapy but who are additionally seeking psychological treatment * Presenting symptoms of one or more internalizing disorders (major depressive disorder, generalised anxiety disorder, panic disorder, agoraphobia, specific phobias, somatoform disorder, obsessive-compulsive and related disorders, body dysmorphic disorder, post-traumatic stress and related disorders) Exclusion Criteria: * 16 years old and under * Not able to speak or read English fluently, which would require more individualised support with interpreters * No access to internet-connected device or confidential space to engage with digital intervention * Not involved with NHS-TT services * Assessed by a qualified psychological professional and not deemed to be eligible for high intensity CBT on the basis of mental health condition and/or risk assessment (e.g., acute risk of suicide at the time of assessment) * Already accessing a high intensity psychotherapy or other forms of psychological treatment (e.g., private therapy, counselling) * Presenting with symptoms of eating disorders, substance use disorders, psychotic disorders, personality disorders, bipolar disorders identified at the time of initial assessment.