UK garden birds with yellow on them

Yellow underneath usually means a blue tit or a great tit — the great tit has a black stripe down the middle. A yellow flash along the wing means a goldfinch or a greenfinch.

4 of the 30 birds on this site fit. Each one links to its full page, with what separates it from the ones it gets mistaken for.

Not here? Describe what you saw — the identifier ranks every garden bird rather than filtering them out, so it will not hide yours.