This is it! A video of all the funny things that Little B got up to while it was staying with me. And a video of how much it loved swimming! it just loved splashing around in water and would do it until it was soaked, dripping wet.
I am happy to say, the morning after Little B flew away, at the crack of dawn, I was woken up by a Honeyeater chirping in the distance. I automatically called out to the open window "Little B?" and a second later a Singing Honeyeater landed on the shrub by the window. I scrambled out of bed and went over to have a look, and it was actually Little B with it's crooked little tail! Little B looked at me and squawked a raucious morning call, and then shot off, back over the fence (our neighbour has a native garden, bless them).
I haven't seen Little B since, but I'm glad I got to see it being a proper bird, living around the neighbourhood behaving like a regular native bird. It's put my mind at ease now that it is not hanging around strangers who might hurt it, and not lost. And I can also stop standing on the bathtub and peering over the fence with binoculars to identify every Singing Honeyeater I hear.