I see them around in Putney, both east and west. And Fawe Park Road residents have built swift nesting boxes in the last few years - some have actual swifts in residence and some have been taken over by other birds (not parakeets though).The population is well down on say 10 or 20 years ago but they still arrive in early May every year, and disappear again in early August.
Jonathan Callaway ● 342d