FD,
I was a similar position last year. Basically, I spoke to HSBC re: Professional Studies Loan, they were very helpful.
Can't remember the details now, but basically told them what was involved in the sponsorship, the terms of it, the costs and how much I would like to borrow, and made it clear that it was a tentative enquiry re: the loan and I was just making sure I actually could get one before going the full distance.
I made these enquiries at the point I had made it to final stage (unsuccessful at final stage unfortunately) and came out of HSBC with paperwork ready to sign had I been successful (bug*er) !
Not sure what other banks are like, but from my own experience and from what others have said, HSBC seem to be the most helpful in cases like ours.
Good luck.
GB.
