A 2cy Little Gull, 4 Common Terns, 1 Common Sandpiper. Around the reserve 1 Reed Warbler singing + scattering of Blackcap, Willow W and Chiffchaff. Gull & terns out in mid bay at 16:30 viewed from Prospect Place or Llwyn Passat.
Also 2 Wheatear on the barrage rocks about 17:00.
Glamorgan Bird Club 
Nice one Peter. Got the birds at 5:00 – to 5:30 from the Penarth Marina side – in fact there were 6 Common Tern.
There were at least 7 by about 18:30 so could be even more tomorrow (assuming they hang around), pretty sure there were only 4 when I first saw them.