it's about 1 inch long, stayed in same position for at least 6 hours, was behind a small tree so not best picture
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Not so much "not the best picture" as no picture at all! Can you try to reload the picture, please? Then hopefully someone will be able to recognise what it was you saw.
Lat/Lng: 51.3963, -0.1349
OS grid ref: TQ298680