Crawling round on the layered cup fungi (previous post) was a tiny fly which I only noticed when I got home and saw the pictures on a larger screen. As this cropped version of one of the pictures shows, even then it came out somewhat pixelated. An ID by iNaturalist suggests it may be one of the Heleomyzid flies, also known as the spiny-winged flies. Some species of these flies are associated with fungi.