it is hard to say as when i try to get closer to the tree they fly off. the little pocket camera that i use was on maximum zoom.
i think they live in a large bush come tree two gardens away, they love those fat balls that next door puts on her tree.
will try and get closer tomorrow, i am putting a water bowl out for them
Bluetits have quite a loud song and a dipping flight, they are quite social. Definitely yellow and blue - if your birds are different colouring, they might be a different sort of tit. Lovely little birds.