Well I sat my third and final stage last week!
My Stage 3 was at the Swanwick Centre with five other guys all around my age (20,20,21,21,22,22!).
I thought the group exercise (a basic logistics game with multiple rules) went very well, and I got involved without being bossy or overbearing.
As for the individual interview, I felt I really cocked up one question.
I should hear back in two weeks, and hopefully I'll post come feedback up here for you all