Hi Freckles I know on Dr Chris's website it states that a bmi of 35 is required for surgery, mine was only about 31 when i had mine fitted however.
I didnt want to take any chances in being refused so to be on the safe side I put my height down an inch and my weight up a bit when I completed the information required via email and I think that made my bmi 32 or 33 and they where fine with that. They dont weigh u or check your height once your in Belgium. I also had to sign a disclaimer though to say it was for aesthetic rather then medical reasons I was having the band fitted.