The Yellow Wagtails are absolutely superb birds, as this photo from this afternoon, hopefully shows.
The White Wagtail is the European race of our own Pied Wagtail, but differs from this bird by having a grey back and much less black on the head. Here's a not-so-good, slightly out of focus photo of two birds from today.
Unfortunately, this isn't a species in its own right, so I can't add it to the Year List proper, but I'll note it down and add it on to the full list at the end of the year. The Yellow Wagtail, however, can be added along with 3 other species I saw at Carsington today, namely:
111 – Willow Warbler (several singing)
112 – Little Ringed Plover (1 on Horseshoe Island)
113 – Yellow Wagtail
114 - Blackcap (one on Stones Island)