Well, that's what I'm thinking, perhaps once the tree blossoms they'll move on? I don't know... I might give the council a call, see if they have any suggestions. I don't want to hurt them or anything, I don't even mind them being there (the dogs seem to have lost interest as they've realised they're too high up), it's just the noise drives me insane in the middle of the night when I'm trying to sleep!