A 70-year-old man complains of urinary hesitancy, poor stream, and nocturia for several months. Digital rectal examination (DRE) reveals a moderately enlarged, smooth, firm prostate. His International Prostate Symptom Score (IPSS) is 15 (moderate). Routine bloods including PSA are normal. According to NICE NG131, what is the recommended initial pharmacological management for moderate-to-severe lower urinary tract symptoms (LUTS) presumed secondary to benign prostatic hyperplasia (BPH)?