Canadian Student visa... Indian in the UK

Hi everybody,
I am an Indian citizen applying for Canadian student visa. Would love to know some more people in my situation!!!!!

I m on HSMP visa (expiries in Nov.2008)
Got admission in Ph.D. neuroscience in Canada. (starting May 2007)
Promised minimum £16,500CD stipend whereby 10k will go as tuition fees.
Married, so will add my wife as dependant!

My queires are:

1) how much money do i need to show in my bank account?

2) How long does it take to get the student visa processed in london? anyone recently got the visa?

3) On what circumstances will i need to do 'medical checkup'? . I am in the UK since last 2.4 years and my wife since last 9 months.!

thnkz... all experts' comment will be appreciated