I checked my eligibility yesterday and was told I could apply from 16th May at 8 am (if I'm up that early on a Saturday).
However. the scheme is supposed to start on 13th May. So is this some crude form of slowing down the mad rush, in an attempt to stop the system crashing ? Earlier you check your eligibility, the earlier you can apply ?
Really, I would've liked to be able to apply before my clients so that I could better answer their questions. I'll be reduced to advising "Dunno, it's my first (and probably only) time too; your guess is as good as mine."