Acute mental health inpatient wards have been criticised for being non-therapeutic. The study aimed to test the feasibility of delivering a psychologically-informed intervention in these settings. This single-arm study evaluated the feasibility of clinical psychologists delivering a ward-based psychological service model over a 6-month period on two acute mental health wards. Data were gathered to assess trial design parameters and the feasibility of gathering patient/staff outcome data. Psychologists were able to deliver key elements of the intervention. Baseline staff and patient participant recruitment targets were met. However, there was significant patient attrition at follow-up, with incorrect contact details on discharge being the primary reason. Implementation of a ward-based psychological intervention appears feasible when implemented flexibly. It is feasible to recruit staff and patient participants and to collect staff outcome measures over a six-month period. However, greater efforts need to be taken to trace patient movement following discharge.