I've got used to seeing and hearing them now and, yes, they're all around Putney and much of London now - I think they even join in the chorus along with the peacocks at Opera Holland Park ... not that there's much chance of that for a while. I suspect if there's any threat to other birds its more from humans using pesticides, destroying habitats, etc - although there seem to be plenty of other species around striking up a dawn chorus when I want to sleep in ... leave the poor parakeets alone!
Michael Ixer ● 1917d