Decticus verrucivorus

[Dense grass] tufts are also used by the males as song perches. Unlike many bush-crickets, they sing most in the early part of the day - from mid-morning to early afternoon, and only during warm weather. The song is usually delivered from a perch on  a grass tussock, and takes the form of prolonged bursts of repeated high-pitched clicks. The rate of repetition increases to about 10 clicks per second within a minute or so of the start of a burst. The volume of the song is quite low, and for many observers a bat detector is needed to locate it at more than a few metres distance. Males are also reported to emit short isolated chirps. [1]

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