On 28th August at about 17:00h I heard what sounded like the 'chuffing train' noise of a Bog Bush-Cricket on my Batbox 3 detector.  The noise peaked at 24 to 25 kHz.  The problem is that the habitat was completely wrong - an allotment, with the sounds coming from tall nettles and Common Fleabane.  The allotment is a Landshare one in a former grazing pasture field in West Sussex.  The location is between the South Downs and Chichester Harbour, just west of the village of West Ashling.

There is no heathland or mire anywhere near this site (the nearest being to the north of the South Downs or the New Forest).

This is the first time I've picked up this noise and I've never heard a Bog Bush-Cricket before, but the sound was exactly like the recording on this website.  There must be another species that I have mistaken this for but I can't think what.  Any suggestions please?

(At 40 kHz I was getting faint ticks at 4 to 6 second intervals that sounded like Speckled Bush-Cricket.)

Thank you.