Patients will have neuromuscular transmission (NMT) monitoring intraoperatively to ensure return of train-of-four count (TOFC) >2 prior to reversal. Muscle relaxant will be limited to rocuronium or vecuronium, at the choice of the individual anaesthetist. As this study is planned to be a 'real world' trial, mode of anaesthesia, analgesia, postoperative nausea and vomiting (PONV) prophylaxis and time of reversal will be determined by the individual treating anaesthetist.