When our kids were little they used to call goldcrests 'squeaky wheels' because their thin, repetitious, high pitched notes sounded like the squeaky wheel of the push-chair.
It will be about three months before goldcrests start singing and at this time of year, because they are quiet most of the time, and because they are so small, these little birds are easily overlooked.
They spend most of their time in conifers but this one was flitting around in a gorse bush, probably on the lookout for spiders - which must be hard to find in January. Sometimes these can be very approachable - this individual came within a few feet of me.
It's remarkable how closely the hue of the goldcrest's yellow crest matches the colour of gorse flowers.