About 5-6 cm in length,
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Shouldn't the pterostigma be reddish for sanguineum?
The pterostigma can be red in quite a few species of Sympetrum, including sanguineum. It doesn't have to be red in sanguineum though - and in most cases it won't be.
Lat/Lng: 49.14, -0.009
OS grid ref: T[453173