A 58-year-old man with hypertension and type 2 diabetes presents for medication review. His BP is 145/92 mmHg (clinic reading). He is currently taking ramipril 10mg OD and metformin 1g BD. His eGFR is >60 mL/min/1.73m$^2$ and ACR is normal. According to NICE NG136, what is the most appropriate next step to manage his hypertension?