I sat the tests on Monday afternoon and received an invite for the personality test yesterday. I got to the technical/HR interview stage 2 years ago and it seems a lot more efficient this time (last time was about 3 weeks before notification of progress to next stage, same amount of time to received the dreaded 'no' email).
My understanding is that stage 1 tests must be passed before receiving an email about the personality questionnaire, but you can still be rejected after completing the questionnaire and therefore not reach stage 2.
By the way, anybody in group 3 in London on Monday afternoon (9 July) ... we were told to leave too early. The lady conducting the tests came to find us but only managed to locate about 10 people from the group. Not ideal, especially after some of us had already asked her what had happened to the diagramming test and the reply was that it had been cut from the series of tests!