BMI (body mass index) is meant to be a predictor of death through heart disease.
20-25 = Factor of 1
25-30 = Factor of 2
30-35 = Factor of 4
However, other factors are more important in the equation, eg not smoking and choosing your parents well!
Sorry cannot answer your question (pass or fail), however as a clinician, I would hazard a guess that your BMI is quite insignificant. I have 2 suggestions,
a) contact BA and ask them
b) work the BMI equation backwards and work out how much you have to lose...shouldn't be too difficult. Cheers and good luck!