I've been thinking - Sabine's Gull from Arctic Canada, Black Tern from Eastern Europe, Curlew Sandpiper from highest Siberia, Balearic Shearwater from the Mediterranean, Black tailed Godwit from Iceland, Arctic Skua from Scandinavia ....... I think the Dyfi Estuary was the birding equivalent of the Spaghetti Junction today! Isn't migration amazing.....