A 58-year-old man is found to have a blood pressure of 165/98 mmHg during a routine check-up. This is confirmed with ambulatory blood pressure monitoring (ABPM) which shows an average daytime reading of 162/96 mmHg. He has no other comorbidities and his QRISK3 score is 8%. According to NICE NG136, what is the most appropriate initial management?