A fairly effective way is to search the road verges at first light with car lights off. These birds feed there and on edges of roadside puddles. Be aware that Olive thrush shares this habitat so concentrate on White wing-bars. When located, use a spotlamp.Hold light steady below bird, which usually freezes. Avoid direct lighting, and avoid moving light to either side as it will take fright.
After feeding (within 15 minutes after sunrise)OGT ascend into forest canopy for Dawn Chorus. It is still possible to locate by scanning thick/thickest areas of canopy. The bird is motionless at this time but the white belly can sometimes be observed.
