A 60-year-old man presents with progressive fatigue, pruritus and dark urine. He drinks 3-4 standard drinks nightly. Examination reveals jaundice, spider naevi and hepatomegaly. Laboratory tests show ALT 110 U/L (normal <40), AST 130 U/L, ALP 150 U/L (30-110), GGT 300 U/L, bilirubin 65 µmol/L (normal <20) and INR 1.5. Ultrasound shows a coarse, nodular liver and splenomegaly. What is the most likely diagnosis?