Firecrest Regulus ignicapillus

Firecrest
Firecrest 2
The Firecrest, also Common Firecrest, with its relative the Goldcrest, are the UK's smallest birds, a little smaller than the Wren.
The Firecrest has a stronger face marking than the Goldcrest, with a white eyebrow and a crest more orange than yellow.
Firecrest
Firecrest 2
The photos in the top row are close to "as taken", quickly and poor, with the bird silhouetted against the sky.
Martin Welbank has adjusted them to show more detail of the plumage in the row above.