There are certain birds that simply push all the buttons; for many they may be birds of prey, Divers, (see post here) Puffins, Gannets, and perhaps the diminutive Goldcrest and Firecrest.
Species: Yellow wagtail
Migrants at Goldcliff
I finally managed to catch up with a bird that has been a little elusive for me over the years, the only other sighting I had was at Dinas some four years ago and that could only be described as a glimpse.