[@Helenph] Thank goodness I have read these reports. I had a colonoscopy on the 17th and can honestly say it was excrutiating with sedation which was topped up three times and with gas and air. I have had several pretty painful experiences in my life but |I think this was the worst. After probably half an hour or so they started again with a smaller camera, which wasn't any better so I think in all I was there for a good hour - maybe more. Never again, unless I have a general anasthetic.