Wandle - migrants flood through

Major passage through the Wandle this morning - one Chiffchaff. For some reason it feels more like a migrant than an overwintering bird. Partly because it's new right here, it's calling and feeding like crazy rather than trying to sing (OK but it could just be a female). Maybe spring is on the way - there's no sign of any Teal or Gadwall so maybe this is it.