Had a message from Mike Le Ves Conte today. Anyone able to check it out?
“As of 12.00 hrs today.Tentatively identified GND on the north shore of the island in Aberdare
Park Lake.First spotted 10.30gmt yesterday (16 Dec) by myself and Peter Priddy (Park Ranger)”
Glamorgan Bird Club 
Have had txt msg confirmation from Mark Hipkin that this turned out to be a Cormorant.