Eventually found the L-t Duck over by Prospect Place with the 7 Scaup and Tufties there [having yomped along the barrage & back!]. Black redstart didn’t show in Penarth Marina, but Grey Wag, 2 Redshank and 2 Turnstone on the outer rocks by R. Ely. Thx to the couple from London who put me on to the LTD from the Prospect PL boardwalk [I had seen it briefly on arrival but could not relocate after a guy walking along the rocks by the waters edge had pushed all the ducks a way offshore] – then asked me if there was anything of interest and had I seen any rats!!??!!. The LTD eventually flew off right back to the S end of the barrage – I hope the London couple got a closer look when they got back round there.