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This is a nice pic, but not a lot of ID features to go on. Have you got any more pictures/approx size etc?
sorry only image, it was couple of mm long i think..though not totally sure
I reckon it may be in the Catopidae family (judging from the shape of the eyes). Most of these are pretty small so your size estimate supports this...
Lat/Lng: 51.4, -2.5
OS grid ref: ST6669