Warbler...willow or chiffchaff? Or another.

Warbler...willow or chiffchaff? Or another.

Observation - Warbler...willow or chiffchaff? Or another. - UK and Ireland. Description: At ynsnhir rspb reserve in the woodland bit. I can't decide.

At ynsnhir rspb reserve in the woodland bit. I can't decide.