In answer to your questions:
1. Questionnaire. Interview at Careers Office about a month later. AIB up to six months later. BRNC up to a year after. All these timescales just a guess really - It was a long time ago that I did it! Think about going on a zero or low carb diet to quickly shed those excess pounds before the medical.
2. See
here.
3. Think it is a year but could be wrong.
Good Luck!
Oggin