Laurie,
Sat selection tests yesterday and can offer the following info based on what has happened to me so far, and what I was told yesterday:
04/07/01: Application sent
26/08/01: Invited to take test
27/09/01: Sat test
15/10/01: Should know result of selection test
26/11/01: (or thereabouts) Interview (if successful)
17/12/01: Results of interview.
Of course, the medical needs to be passed after that, so in the unlikely event that I get that far, it will be at least a July - January process. I think it would be more likely to be a July - April process, though.
Hope that's of some help