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appears to have a reddish tail?
it might indeed have a reddish tail but it isn't at all easy to see what is going on at the stern! If it has a red-tail for sure then B. lapidarius is the answer and not B. hypnorum (always a white tail)
Lat/Lng: 52.3253, -2.4544
OS grid ref: SO691697
warm early spring evening