At least I think it’s a Coot dabbling away at the water. I always get Coots and Moorhens mixed up. One sort has a white patch on its head, the other a red patch. They look very similar except that Moorhens are slightly smaller? The weird thing about the chicks is that the have a slightly red patch of feathers above their beaks. The parent (not sure if it’s male of female) certainly seems to be keeping an eye on the chick.
Photo taken at Westport lake a couple of weeks ago during a walk round the nature reserve.