I believe that Willow Tits are now extinct in Surrey and have been for about fifteen years. Anyone who reports one is either extremely lucky or somewhat dodgy. The places where I used to see them, or where they used to occur, seem the same now as they were some years ago. I don't think that the problem was with the habitat. What I have noticed with Willow Tit is that you only seem to get them where there are either no, or very few, Blue, Great or Marsh Tits. The Willows cannot cope with the competition. In Sussex I used to watch Willow Tits in West Dean Woods, and in 2009 watched a pair of Marsh Tits rob a pair of Willow Tits of their excavation. Despite recent claims, I believe that they are now extinct there too. The clue to the Willow Tits decline is in its Latin name borealis. It is a boreal bird and it is retreating north because of all the things that global warming throws at it. What staggers me about the declines of some of our formerly common birds is how quickly, how suddenly they decline and are then gone. One problem with Willow Tit (unlike in Europe), is they can be hard to separate from Marsh Tit, and false reports make it difficult to follow what is really happening.