Secret Visage
Striker
Always best to avoid a potential awkward situation, so best hand your notice in on your first day at your new job. Just phone it in to whoever you know is at work before 9 then pop into your new place of work a few minutes early to show you're keen.
If that isn't actually feasible, other option is to not leave.
I think you next job sounds enjoyable.
Thankfully this is the last one and then time for the nursing home.