Pied Wagtail

Observation - Pied Wagtail - UK and Ireland. Description: Wagtail in the stream as it crosses the beach. Black back makes me think yarrellii?
Wagtail in the stream as it crosses the beach. Black back makes me think yarrellii?
Observation - Pied Wagtail - UK and Ireland. Description: Wagtail in the stream as it crosses the beach. Black back makes me think yarrellii?
Wagtail in the stream as it crosses the beach. Black back makes me think yarrellii?