Patients will be randomized into one of 3 groups - A, B or C. In order to remove the major confounding factor of hypovolaemia, all patients will have an oesophageal doppler inserted in order to achieve fluid optimisation. Each group will then either have an epidural, spinal or a PCA for post operative analgesia depending on the randomisation. All patients will follow a common postoperative care pathway to standardize the other factors.

Patients will be asked to report parameters including pain visual analogue score (VAS) chart three times a day. Recovery of bowel functions (passage of flatus, bowel movement, and diet intake), additional analgesia consumption, time to first ambulation, analgesia related side-effects and time to discharge will be recorded.

In addition whilst the patients fluid status is optimized during surgery with the oesophageal Doppler, the physiological changes that occur with the steep trendelenberg position and the pneumoperitoneum will be recorded.