The Blue Tit is a pretty yellow, blue and green/grey bird with an attractive blue cap; it has a white face with a black eye line and black chin. Male and female have similar plumage.
It is a common bird in gardens and countryside, resident throughout the year; gregarious with its own kind and other birds and amusingly acrobatic as it seeks out insects.
Blue Tit (left) and Great Tit (right)
Blue Tits on garden feeder (and Long-tailed Tit, top right)