Grey Wagtail Behaviour

I returned to Kennell Vale yesterday looking to capture more Dipper behaviour which was quite successful with around forty images captured,

But what I was really pleased with was the performance of the Grey Wagtail which followed in its wake.   This lively little bird arrived at the same favoured perch point that the Dipper had just used and when its behaviour was studied it followed on in this vain by flying to and using all of the same points in the shallows that the Dipper had foraged before it and was successfully catching the same Caddis and Mayfly larvae prey but stopping short of actually diving under the water,

Is there some sort of copy-cat competing going on here ??,   If that is the case the Dipper does not seem to be aware of it as on the occasions that both are present the Dipper just tends to ignore the Wagtail where as an infiltrating Dipper would be very quickly dealt with,

The sequence of images below shows the busy Grey Wagtail foraging until the last image by which time it was very full and contented,

                                        A very clever and contented little bird !!