Design pilot study, single arm controlled study Hypothesis Deep neuromuscular blockade provided intraoperatively for patients undergoing laparoscopic colorectal surgery will have an increase in oxygen delivery as measured by haemodynamic data using oesophageal doppler. Secondary hypotheses Deep muscular blockade will provide the same surgical operating conditions at lower abdominal inflation pressures. The patients will experience less pain postoperatively due to less forced distension of the peritoneum demonstrated by less analgesic requirements. Patients will therefore spend less time in recovery and be able to mobilise earlier.Participants and Recruitment Patients will be assessed in preassessment clinic by a clinical nurse specialist for eligibility and provided with a patient information sheet. On the morning of planned surgery patients eligible who wish to be included in the study will be consented for the study in accordance with the International GCP guidelines by the anaesthetic researcher, and given a form to sign.