I think this is of the Ergot genus (maybe purpurea?), curious to know if it growing in Cock's-foot is significant as i have only read of it using Rye sp.
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
Lat/Lng: 53.4068812, -2.8780428
OS grid ref: SJ417903