Hi Bolso,
Compulsory activities start on September 30, and classes themselves two weeks later. But it's advisable to arrive at least several days earlier. I know that some people will move to Oxford as early as August (for English courses).
As for scholarships... well, nobody on the forums mentioned that he/she got one. I guess they were quite rare from the very beginning. But AFAIK, generic SBS scholarships are awarded in each round, so there's still a chance. The decisions are made several days after the admits are released, so you'll have to wait.
Also, you'll receive a email with the instruction how to access Intranet, and I think it could be worth to log in: there is news and announcements section there (to keep track of scholarship decisions

), and also some pages with course information. Oh, and forum, of course

.