Bmi is not the best way to judge your "weight" as it does not take into account your build or muscle mass etc... For example Jonny Wilkinson was classed as clinically obese if you work out his BMI, I wouldn't in any way class him as that ...
Do not worry too much, I've been recommended to get down to one of 25, however to do that I believe that I would look pretty anorexic... I am pretty sporty, and quite a bit of muscle, as well as the fat if that doesn't sound too daft...I'd rather keep my curves than lose the weight to get to my BMI....
Get some advice off a doctor/nurse/fitness professional...The last nurse I saw for a checkup laughed at me having to be 9st...IT'S NOT POSSIBLE, I'D LOOK AWFUL....(and she was skinny) however the doc i saw before that said I had to get down to that weight...
Sorry for the long post...It's just something close to home...please be sensible..and don't always rely on the BMI figures...