I am shocked to read of such a callous uncaring surgeon. To be honest if it were me, I wouldn't want to put myself in his hands. I know you are NHS and don't have much choice but this would be a major turnoff for me.
I also went to Mr. Sufi, like Sharonimo, but privately, and I went armed with all my research. My BMI wasn't too high to begin with (37.8) but I knew I wanted the sleeve and no other procedure. If he had tried to talk me into anything else I'd have walked out and chosen another surgeon, but I guess you don't have that option.
Listen to tealovingsleever; she managed to stand up to some considerable pressure to have a different op. Heck it's your body and your decision!