The goal of this randomised controlled trial is to test a cognitive-behavioural intervention, Problem Solving Treatment for Diabetes (PST-D) in patients with type 2 diabetes. The main questions it aims to answer are: * To evaluate the clinical effectiveness of PST-D compared with the attention control group. * To determine the impact of PST-D on patient-centred, behavioural, and psychosocial outcomes. * To identify independent factors associated with an improvement in HbA1c and reductions in incidence and progression diabetic retinopathy, diabetic neuropathy, diabetic peripheral neuropathy, and visual impairment at 18-month follow-up in both groups; and determine if these factors mediate the associations between the PST-D intervention with the above outcomes. * To quantify the incremental cost-effectiveness of PST-D compared with the attention control group at 18-month follow-up. * To understand participants' views, experiences, and opinions about PST-D; and the barriers and facilitators to program completion. Participants will complete blood tests, ocular examinations, and a series of questionnaires at baseline, 6-month, 12-month, and 18-month follow-up. Participants will also complete the intervention/ control group sessions conducted over the phone, video call, or face-to-face depending on the participant's preference. Researchers will compare the intervention group against the attention control group to determine the effectiveness of PST-D on improving clinical, patient-centred, behavioural, and psychosocial outcomes.
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Change in HbA1c over 18 months
Timeframe: Baseline, 6-month, 12-month, 18-month