Oak Hook-tip moth - male: smaller (up to 30mm wingspan), darker brown colour and with feathered antennae.
Oak Hook-tip moth - female: larger (up to 35mm wingspan), lighter, yellower colour and without feathered antennae.
Wingspan: male 20-30mm/female 35mm; UK flight time May-Aug.
Caterpillars feed on oak.
Oak Hook-tip moth - female with golden under-wings
The Beautiful Hook-tip moth: wingspan 23-27mm; UK flight time Jun-Aug.
Pebble Hook-tip: above photo kindly supplied by Jeff Davies.
The Pebble Hook-tip's wavy under-wing. Wingspan 27-35mm; UK flight time May-Aug.