A 52-year-old man with type 2 diabetes and hypertension is found to have microalbuminuria (Albumin:Creatinine Ratio [ACR] = 5 mg/mmol) on screening. His blood pressure is 145/90 mmHg, currently treated with amlodipine 10mg od. His HbA1c is 58 mmol/mol. What is the most appropriate next step in management according to NICE guidelines?