A 72-year-year-old man with known benign prostatic hyperplasia (BPH) presents with increasing lower urinary tract symptoms (LUTS), including nocturia x4, weak stream, and a sensation of incomplete bladder emptying. His IPSS score is 18. He has tried lifestyle modifications with minimal benefit. His PSA is normal and DRE reveals a moderately enlarged, smooth prostate. What is the most appropriate next pharmacological management according to NICE guidelines?