It's an interesting discussion, which I join from slightly further afield (Dordogne, France). - I have been studying the local bird behaviour for 18 years now and it has dramatically changed over that period. Many of the birds, that we could always rely on to appear are either not appearing anymore, or arriving at different times (usually earlier). - On the positive side, we are now seeing breeds that were not normal in our area, which is a delight!
Normally, I would stop feeding the birds, as soon as they lose interest in the feeders (normally around May), but this year, I still have feeders out and demand is still high. It's been a very hot year so far and insect numbers in my area have fallen dramatically, removing one food source. Add to that the intense heat and to some extent, bird flu and we may have a recipe for relocation to find food, or starvation for some species?
I do a lot of macro photography and the insect decline this year in particular is scary, with numbers down in my garden by around 80%. - Hopefully, it is simply the intense heat this year and future years will bring back some normality, but with global weather patterns also changing, it should be a concern to us all.