HEpatic Resection Analgesia and Length of time to Discharge

INTERVENTION: Patients will be randomised to either thoracic epidural analgesia or intrathecal diamorphine with Fentanyl PCA. CONDITION: Topic: Anaesthesia, perioperative medicine and pain management, Hepatology; Subtopic: Anaesthesia, perioperative medicine and pain management, Hepatology; Disease: All Anaesthesia, perioperative medicine and pain management, All Hepatology ; Cancer PRIMARY OUTCOME: Length of stay until medically fit for discharge; Timepoint(s): Time until medically fit for discharge post operatively INCLUSION CRITERIA: 1. Consent for enrolment 2. Patients presenting for elective one‐stage open Hepatic Resection surgery at the Royal Free Hospital, London 3. Patients receiving a midline +/‐ a transverse incision in the right upper quadrant (‘reverse L incision’) 4. No contraindication to, or refusal to receive, central neuraxial block (epidural or spinal analgesia) 5. Aged at least 16