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This is one of the Oak Bush Crickets, Meconema sp. Given that your sighting was in London in August and appears to be adult, there is a chance that it's the relatively newly-arrived Southern Oak Bush Cricket, Meconema meridionale, rather than the native Oak Bush Cricket, Meconema thalassinum. The survey website at www.orthoptera.org has a facility to submit a photo with your record and they would be able to say for sure
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Lat/Lng: 51.531800969511, -0.15606164932251
OS grid ref: TQ279830