Lesser Stag Beetle, Woodland at Dancers End, Herts
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I think the wide head and the prominent spurs on the mandibles indicate a male, see:
And to be really pedantic, Dancersend reserve is in Buckinghamshire rather than Herts!
Entomologist and biological recorder
Lat/Lng: 51.777, -0.6901
OS grid ref: SP904095
Found in the Woodland area near to a pile of logs