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Yes, this is a male. The other British species of Ctenicera, C. pectinicornis, has even longer 'teeth' on the antennae.
I always enjoy seeing thse colourful beetles, but have to travel north to do so, they aren't found in the south-east.
Entomologist and biological recorder
Lat/Lng: 54.5, -6.0
OS grid ref: NW4223