I think you are being very kind, Lucid, to keep an eye out for the rabbit. I have been looking after the family rabbit for the last year and although he lives in a hutch in the garage I let him out to roam most days as I don't like animals to be cooped up. He only got out of the garden once. I wouldn't leave him out overnight because of foxes though. I used to think rabbits were a boring pet but I've grown very fond of Basil since I had him. He has a calming effect on me.
To think that London, or anywhere else for that matter, does not belong to any one demographic