Just in the last week, we have been getting more avian visitors even than during the coldest part of the winter (including a pair of goldfinches which turn up at breakfast time and always put a smile on my four-year-old's face ). What has been really striking, however, is the sudden influx of blackbirds. We had three regular visitors - two males and a female - which I assumed were a pair and last year's fledgling. Now we have anything up to six extra ones, all rather brown and a bit smaller than the "regulars". This is in a classic pocket-handkerchief north London back garden. Have they been forced away from normal feeding grounds by bad weather, or are they incomers from across the Channel, or what?