Chiffchaff?

Chiffchaff?

Observation - Chiffchaff? - Global. Description: I am guessing chiffchaff. Or maybe a Willow Warbler! Very active little birds, diving into cover & hard to catch for a photo. Have heard a call that might be described as chiff chaff with a good imagination! Can anyone help?

I am guessing chiffchaff. Or maybe a Willow Warbler!
Very active little birds, diving into cover & hard to catch for a photo. Have heard a call that might be described as "chiff chaff" with a good imagination!

Can anyone help?