Wiry fine dense growing grass, yellowed from winter... can grow very short (10mm) or up to 20cm
No identification made yet.
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It looks a bit more like an Agrostis to me... but it is really difficult to say, the picture of one plant, including roots would help, idealy later this spring or in summer... unless someone else is confident identifying this one?
much of the turf on the grazed parts of Pen y fan is Nardus and Agrostis, whilst fescues are more frequent on the rocks; your photo not specific enough to say really
Lat/Lng: 51.8, -3.5
OS grid ref: SO0022