Bald as a Coot is a saying due to the hard white plate on the front of its forehead, the Moorhen has the red beak and has much larger feet than the Coot
At Melton Lakes this Coot really was struggling to get into the water, it is pure speculation on my part but as this is fishing lake I wonder if somehow a fishing line got tangled in its left leg knuckle. I'm happy to report though as the Coot entered the water there appeared to be no infirmity at all