I had an appt quite a few years ago at the clinic in regents park.
Aibu that I was awful at it. I was soooooo embarrassed and ashamed, I kept on expelling out the tube, I think it was when gas came out.
We had to give up in the end and I had to go to their loo and stand up and down trying to get all the water out of my bowel. I didn't get my money back.
So gross. Has anyone succeeded at it.