Cardiff Bay 9am-15pm
Just to backup others reports. Great Northern Diver @ DrWho (juv 1st winter). Black Redstart (male) @ Barrage. Tuft x Poch (xHybrid) @ boardwalk. Kingfisher x2 @ Hamer & board. Kestrel x2 @ NNR. Sparrowhawk @ Drwho. Cetti (call only) @ Penarth s. Shelduck flying over. Flock of 20 Lesser Redpoll all over. 20 Common Gull @ Barrage. 47 species, 3 rares best day in Bay so far!
Edited confirmation: Little Gull @ Barrage, is now confirmed as Black Headed Gull with early summer plumage. Scaup is now listed as a Tufted x Pochard (xHybrid). My reasons: total grey on back with no mottling, extended black marks on beak tip, reddish eyes, brownish hue to head. Cheers, James
HD Links: Black Redstart Great Northern Diver xHybrid Duck
Glamorgan Bird Club 
Spooky (sorry don’t know your real name), your gull sounds like a summer plumage Black-headed. It’s not uncommon to see the odd bird like this even this early. The Scaup-like duck is a hybrid, but keep an eye open for the Lesser Scaup whch is also around – I’ve not heard of any Greater Scaup recently.