Goldcrest female currently migrating through Shetland. However, the orange of the male is often difficult to see when the bird is relaxed. It is an adult, but the eyering and ear coverts seem a bit dull, so maybe first winter bird.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/33138035@N07">Cj Hughson</a> from Shetland
CC BY 2.0
<p><a rel="nofollow" class="external text" href="https://www.flickr.com/photos/33138035@N07/4000901770/">FEMALE GOLDCREST regulus regulus</a>
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<ul><li>Uploaded by <a href="//commons.wikimedia.org/wiki/User:Berichard" title="User:Berichard">berichard</a></li></ul>