Grey Wagtail

I had gone out late to my local haunt @ the Moat.Watching and feeding the Ducks! The Sun was setting at a pace and I still didn't really have a good Blip for the day!
Suddenly a couple of Grey Wagtails came down for an Evening drink.Having tried a few shots,I was hitting 1/200@ f8 on 6400 ISO. so having nothing to lose? I turned on the inbuilt flash.And @ 100feet or more, this is the result I got?
With a little L/R work of course!
It's the catch lights in the eyes that give it away?