People with psychosis often have prolonged in-patient1 admissions at high personal and economic costs. This is due in part to cognitive, affective and behavioural processes that delay recovery and discharge. For many, these processes are affected by enduring insecure attachment styles. People with insecure attachment struggle to manage strong feelings when unwell, and ward staff may struggle to know how best to offer support. Here, we outline the model of interpersonal process in cognitive therapy, and how this may be adapted to capture beliefs and behaviours associated with insecure attachment. Psychological interventions in acute care often fail due to implementation issues. For this reason, and in line with current guidance on developing complex interventions, we report on a series of Patient and Public Involvement (PPI) consultations with people with lived experience of psychosis, family members and ward staff on the potential utility of these attachment-based CBT models. The PPI meetings highlighted three themes: (1) the need to improve staff–patient interactions on wards; (2) continuity in staff–patient relationships is key to recovery; and (3) advantages and barriers to an attachment-based CBT approach. We conclude by describing how the models can be implemented in routine clinical practice, and generalised across services where interpersonal cognitive and behavioural processes may contribute to delays in people’s recovery.