Eleven subspecies of the White Wagtail (Motacilla alba) are currently recognised and they all have slightly different plumages.
This is Motacilla alba alba, the nominate subspecies of the White Wagtail which occurs on the European continent and migrates down as far as Kenya.
M. a. alba winters in the south part of its range and West and East Africa, Arabia and South-west Asia.

Hayarkon Park, Tel Aviv, Israel, 25 & 29 December 2019