A 55-year-old man attends his GP for a blood pressure review. On three separate occasions over 2 months his clinic blood pressures are around 155/96 mmHg. He is a non-smoker with BMI 30 kg/m², no diabetes, no chronic kidney disease and no prior cardiovascular disease. His 5-year absolute cardiovascular risk is calculated at 12%. According to current Australian guidelines, what is the most appropriate next step in management?