A 52-year-old man undergoes a health check. He is asymptomatic. His blood tests reveal: Total Cholesterol 6.5 mmol/L, HDL Cholesterol 0.9 mmol/L, Non-HDL Cholesterol 5.6 mmol/L, Triglycerides 2.5 mmol/L. His calculated QRISK3 score is 18%. He has no history of cardiovascular disease. According to NICE CG181 (Lipid modification), what is the most appropriate initial management?