A 58-year-old man attends his GP for follow-up of elevated blood pressure. On three separate occasions over 3 months his seated blood pressure has been around 150/92 mmHg. He is a non-smoker with total cholesterol 6.0 mmol/L and HDL 1.0 mmol/L. Using the Australian CVD Risk Calculator, his 5-year absolute cardiovascular risk is estimated at 12%. He has no diabetes or chronic kidney disease. According to current Australian guidelines, what is the most appropriate management strategy now?