A 55-year-old man with Type 2 Diabetes Mellitus and hypertension attends his annual review. His blood pressure is well-controlled at 132/84 mmHg on amlodipine 10mg daily. His latest HbA1c is 55 mmol/mol, managed with metformin 1g BD. His eGFR is 75 ml/min/1.73m$^2$. A urine albumin:creatinine ratio (ACR) result is 42 mg/mmol (persistently elevated on repeat testing). According to NICE NG138 (Type 2 Diabetes) and NG136 (Hypertension), what medication should be added or initiated?