Nine days later.
Don't worry, it'll not be a weekly event - I'm just "a bit chuffed".
No sign of another -- YET.
NOT that I'm really surprised, just chuffed.
I'm, also, a bit chuffed by the way I managed to photoshopically "remove" the Avocado stone holding the only other leaf at that jaunty angle, rather than lying on the pot edge.