To Identify if a COPD Self-management App Can Safety and Appropriately Identify When Patients Are Not on the Best Medication Plan for Their COPD Symptoms and Support Their COPD Management.

This study is an open-label randomised control trial with inbuilt pilot phase and qualitative sub-study: Phase 1 (pilot - 50 participants): Interim futility analysis on adherence to intervention advice Phase 2 (efficacy - 746 participants (including pilot phase participants): Safety acceptability and efficacy of intervention. This includes the qualitative sub study 15-20 participants (from the 746 Phase 2 participants). Qualitative Sub-study: Acceptability of the intervention (15-20 intervention participants) This trial will explore whether the introduction of the treatment realignment algorithm can be used as a safe, effective and acceptable tool to assist patients to achieve optimal, guideline based inhaled therapy and therefore provide greater symptom control and lowered exacerbation risk for COPD patients. To assess effect of the intervention on patients' symptom control, including exacerbation frequency and patient wellness scores. Main objectives * To understand the intervention pathway in the pilot phase and to identify additional patient support mechanisms for the efficacy phase in order to maximise healthcare equality * To assess the levels of app usage and engagement * To assess patients' experience of using the intervention Study Design: Open-Label Randomised Control Trial with inbuilt pilot phase Qualitative Sub study: Phase 1 (Pilot): Interim futility analysis on adherence to intervention advice Phase 2 (Efficacy): Safety, acceptability and efficacy of intervention Qualitative Sub-study: Acceptability of the intervention. The research question is to explore the safety and efficacy of the treatment re-alignment algorithm as part of a digital self-management application (app) in patients with COPD.