Grey Wagtail

With such a beautiful array of pastel colours? I wonder who in their infinite wisdom,chose the name Grey Wagtail?
  I had the joy of its company for a good 15 minutes.It was quite happy flying off,but always coming back to the log each time.
   I decided to risk the sharpness a little to use the lens wide open and isolate the subject from its surroundings.I think it has worked?