Until very recently I lived within easy walking distance of the lake. This morning Bob and I drove there from Aberystwyth, following in Edwards footsteps.
We met a keen birdwatcher from Romania, Nandor Veres, and we all enjoyed nice views of the Ring-necked Duck.
This is not a great photo but it may help to show some of the differences between it and Tufted Ducks ie head shape, facial markings and the bill.
The 7 Whooper Swans, all adults, were also there but I only managed one photo which did not have all of them with their backsides in the air.