What kind of wagtail?

What kind of wagtail?

Observation - What kind of wagtail?. Description: Can you identify this wagtail please? With his black cap and black bib, pale yellow face, he doesn't seem to fit the yellow or the grey description...... any ideas anyone? Thank you!

Can you identify this wagtail please? With his black cap and black bib, pale yellow face, he doesn't seem to fit the yellow or the grey description...... any ideas anyone?
Thank you!